Final volume of the helium gas is 2.67 L.
What is helium gas?Helium gas is an odorless, colorless, tasteless, non-toxic, and non-flammable gas. It is the second most abundant element in the universe and makes up about 24% of the elemental mass of the universe. Helium is a noble gas and is not known to form any compounds. It is most commonly used in cryogenics and as a pressurizing gas in airships, weather balloons, and diving bells. It is also used in gas lasers, welding, and other industrial applications. Helium gas is also used in medical applications such as MRI scans, and in scientific research such as spectroscopy and nuclear magnetic resonance spectroscopy.
Initial Conditions: T1 = 300 K, P1 = 0.5 atm, V1 = 2.0 L
Final Conditions: T2 = 400 K, P2 = 1.0 atm
Numerical Setup:
V2 = ?
P1V1/T1 = P2V2/T2
V2 = P1V1T2/P2T1
V2 = (0.5 atm)(2.0 L)(400 K)/(1.0 atm)(300 K)
V2 = 2.67 L
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What is the final temperature (in °C) of 690.1 g of water
Answer:
32C Is the water hot or cold?
Explanation:
The final temperature of 690.1 g of water is 20.024°C.
To find the final temperature of 690.1 g of water, we need to know the initial temperature and the amount of heat added to the water. Water has a specific heat capacity of 4.184 J/g°C.
Here is an example calculation:
Let's say the initial temperature of the water is 20°C and we add 100 J of heat. To find the final temperature, we can use the equation:
q = mcΔT
where q is the heat added, m is the mass of the water (690.1 g), c is the specific heat capacity of water (4.184 J/g°C), and ΔT is the change in temperature.
Solving for ΔT:
ΔT = q / (mc)
ΔT = (100 J) / (690.1 g × 4.184 J/g°C)
ΔT = 0.024°C
We multiply the original temperature by the temperature change to obtain the final temperature:
final temperature = initial temperature + ΔT
final temperature = 20°C + 0.024°C
final temperature = 20.024°C
So the final temperature of 690.1 g of water is 20.024°C.
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A tank contains 5.00 moles of O_2, 3.00 moles of neon, 6.00 moles of H_2S, and 4.00 moles of argon at a total pressure of 1620.0 mm Hg. Complete the following table
The complete table is shown in the attachment in which total 18 moles have a mole fraction of 1, Pressure fraction is also 1 and the total Partial pressure is 1620 mm Hg.
The mole fraction of any ingredient in a mixture is the ratio of the amount of that ingredient's moles to all other ingredients' combined moles. The partial pressure of each gas in a mixture of gases is calculated by multiplying the total pressure by the mole fraction of that gas.
An idea is the partial pressure of a gas (rather than something we can measure). We consider the pressure of each gas in a mixture to be a component of the combination's overall pressure. Each gas has a certain pressure when contained by itself. Those are highlighted and located at the top. The same amounts are then once more pushed into the same container, increasing both the pressure and the total number of moles.
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ph-dependent; a small change in ph produces a large change in the rate of the process. this is true not only for the many reactions in which the ion is a direct participant, but also for those reactions in which there is no apparent role for ions. the enzymes that catalyze cellular reactions, and many of the molecules on which they act, contain ionizable groups with characteristic values. the protonated amino and carboxyl groups of amino acids and the phosphate groups of nucleotides, for example, function as weak acids; their ionic state is determined by the ph of the surrounding medium.
when the ph of the medium changes, the ionization state of the active groups of the enzyme and its substrate also change, thus altering the rate of the reaction.
What is reaction?A response is an action that is made in response to an event. It can be physical, mental, or emotional in nature, and can range from positive to negative. Reaction can be used to express feelings such as joy, surprise, anger, disappointment, and even fear. It is most commonly seen in social situations, where people respond to one another and the environment around them. Reactions can also be seen in animals and other organisms, as they respond to their environment in order to survive. Reactions can help us to understand ourselves and the world around us, and can help us to make decisions and take actions.
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The standard definition of a quart is equal to 947 mL.
Calculate the percent error of a student's measurement if she found the experimental value of the volume of one quart of water to be equal to 925 mL.
Type answer:
Answer:
2.32%
Explanation:
% error = (|experimental value - actual value| / actual value) x 100
where the actual value is the accepted or true value, and the experimental value is the value obtained through measurement.
In this case, the actual value of the volume of one quart of water is 947 mL and the experimental value is 925 mL.
% error = (| 925 - 947 | / 947) x 100
% error = (22 / 947) x 100
% error = 2.32 %
So, the percent error of the student's measurement is 2.32%. This means that the student's measurement is 2.32% different from the true value.
If 50.5 g of KBr are dissolved in 400.0 g of water at 25.0 °C in an insulated container, a temperature change is observed. The ∆H of solution of KBr is 19.9 kJ/mol. Assuming that the specific heat of the solution is 4.184 J/(g °C), and that no heat is gained or lost by the container, what will be the final temperature of the solution?
The final temperature of the solution is 30 degrees.
What is the final temperature of the solution?We know that we can be able to obtain the heat that has been evolved or absorbed by the system by the use of the formula that says; q = mcdT
m = mass of the object
c = heat capacity
dT = temperature change
We would then have;
Number of moles of KBr = 50.5 g/119 g/mol
= 0.42 moles
Then;
19.9 * 10^3 * 0.42 moles = 400 * 4.184 * (T - 25)
8358 = 1673.6T - 41840
T = 8358 + 41840/1673.6
T = 30 degrees
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When limestone is heated during Step 1, an equilibrium is established. Which of the following expressions is the equilibrium constant for the decomposition of limestone?
A.
[CaO]
B.
[CaCO3]
C.
[CO2]
D.
[CaO] × [CaCO3]
The decomposition of limestone is the reaction of calcium carbonate (CaCO3) with heat to form calcium oxide (CaO) and carbon dioxide (CO2).
The equilibrium constant for a reaction is typically represented by a specific symbol, such as Kc or Kp, and is a measure of the relative concentrations of the reactants and products at equilibrium.The equilibrium constant for the decomposition of limestone is represented by Kc and is the product of the concentrations of the products raised to their stoichiometric coefficients, divided by the product of the concentrations of the reactants raised to their stoichiometric coefficients. Kc = [CaO] * [CO2] / [CaCO3]. Therefore the correct answer is D. [CaO] × [CaCO3]
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water molecules form hydrogen bonds between each others. hydrogen bonds are: (select all that apply) (check all that apply)
Water molecules form hydrogen bonds between each others. Hydrogen bonds are Non - Covalent bond. Hence the correct option is (b).
Hydrogen bonds are a type of non-covalent bond that form between electronegative atoms, such as nitrogen, oxygen, or fluorine, and hydrogen atoms that are covalently bonded to these electronegative atoms. In water molecules, hydrogen bonds form between the partially positive hydrogen atoms of one water molecule and the partially negative oxygen atoms of another water molecule. Hydrogen bonds are relatively weak compared to covalent bonds, but they play a crucial role in determining the properties of water and many other biologically important molecules. For example, the hydrogen bonds between water molecules are responsible for the high boiling point and low vapor pressure of water, as well as its high surface tension. Hydrogen bonds also play a key role in stabilizing the shape and function of proteins, DNA, and RNA, as well as in mediating the interactions between these biological molecules. Overall, hydrogen bonds are a unique type of non-covalent interaction that are essential for the stability and function of many important biological and chemical systems.
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Question - Water molecules form hydrogen bonds between each others. hydrogen bonds are_____. Select the correct option from the following:-
(a) Covalent bond
(b) Non - Covalent bond
(c) Ionic bond
(d) Polar bond
Read the Safety Data Sheet (click SDS icon below) of hydrogen peroxide to identify the recommended way to store this substance. SDS Select one: In an open container in a bright and humid environment In a glass, leak-proof bottle on a shelf or cabinet In a tightly closed container in a dry and well-ventilated place In a well-ventilated container in a closed, dry area
The recommended way to store hydrogen peroxide is in a tightly closed container in a dry and well-ventilated place.
What is hydrogen peroxide?Hydrogen peroxide is a chemical compound with the formula H2O2. It is a colourless liquid, slightly more viscous than water, and is a strong oxidizing agent. Hydrogen peroxide is used in a variety of industries and applications, including as a bleaching agent, antiseptic, and disinfectant. It is also used in rocket propulsion and to manufacture rocket fuels. The compound has many other uses, such as in the production of paper, textiles, and dyes, and in water treatment. Hydrogen peroxide is highly reactive, and can be dangerous if handled improperly.
This is to ensure that the hydrogen peroxide does not become contaminated with air, moisture, or other contaminants that could reduce its efficacy. It is also important to store the hydrogen peroxide away from combustible materials and sources of ignition, as well as away from food and beverages. Additionally, it is important to keep the container away from direct sunlight and other sources of heat. Finally, it is important to keep the container away from children and pets.
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The limiting reactant is
a
the reactant that does not get completely used
b
completely consumed; there is no excess remaining
c
said to be the reactant that is in excess
In the concept of percent yield, the limiting reactant is completely consumed; there is no excess remaining.
What is percent yield?Percent yield is defined as the ratio of actual yield to the theoretical yield multiplied by 100. If the actual and theoretical yield are same then the percent yield is 100%.If actual yield is less than the theoretical yield then the percent yield is less than 100%.Reason of this condition arising is the incompletion of reaction or loss of sample during recovery process.
In cases where percent yield is over 100% it indicates that more sample is recovered than the predicted amount.This condition arises when there are other simultaneous reactions taking place leading to the formation of product. It can also arise if there is incomplete removal of impurities from the sample .
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A Lewis acid is a. a proton donor b. a proton acceptor c. an electron-pair donor. d. an electron-pair acceptor. e. never viewed also as a Bronsted-Lowry acid.
Option (d) is correct. Lewis acid is a electron pair acceptor. It accepts the electron pair.
Lewis acid is a substance that can accept a pair of nonbonding electrons. A Lewis acid is an electron-pair acceptor. It accept an electron pair. Lewis Acids are Electrophilic. They are electron attracting. All cations are Lewis acids because they are able to accept electrons. The atom, ion or molecule with an incomplete octet of electrons can act as an Lewis acid. The Molecules where the central atom can have more than 8 valence shell electrons are classified as Lewis acids. Molecules that have multiple bonds between two atoms of different electronegativities considered as Lewis acid.
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How many particles are in 176 grams of Fe(OH)2.
To solve this we must be knowing each and every concept related to mole and and its calculations. Therefore, 1.17×10²⁴particles are in 176 grams of Fe(OH)[tex]_2[/tex].
What is mole?A mole is merely a measuring unit. In reality, it is one of International System of Units' seven foundation units (SI). When basically determines are insufficient, new units are created.
Chemical reactions frequently occur at levels that use grams would be inappropriate, but using actual figures of atoms/molecules/ions would also be misleading.
It's much easier to write' mole' than '6.02x10²³' whenever you wish to refer to a huge number of things. That is essentially why and how this particular component was created.
mole =given mass ÷ molar mass
given mass of Fe(OH)[tex]_2[/tex] =176 grams
Molar mass of Fe(OH)[tex]_2[/tex] =89.8g/mol
number of moles=176/ 89.8
=1.95moles
number of molecules=1.95moles ×6.022×10²³
=11.7
=1.17×10²⁴particles
Therefore, 1.17×10²⁴particles are in 176 grams of Fe(OH)[tex]_2[/tex].
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an ideal gas is cooled from 100 c to -43 c in a sealed container while maintaining a constant pressure. which of the following statements are true?
The volume of the gas decreases as it is cooled, while maintaining a constant pressure.
What is pressure?
Pressure is defined as the force exerted per unit area. It is a scalar quantity and is measured in units of force per unit area, such as pascals (Pa) or pounds per square inch (psi). Pressure can be exerted by a gas, liquid, or solid on a surface, and it can be exerted in any direction. It is the ratio of force to the area over which that force is distributed. This means that a small force exerted over a large area will have the same pressure as a larger force exerted over a smaller area.
When an ideal gas is cooled from 100°C to -43°C at a constant pressure, the temperature decreases and the volume of the gas decreases. This is because the gas molecules lose energy and move slower, which means they take up less space.
The ideal gas law, PV = nRT, states that the product of pressure and volume is directly proportional to the number of moles of gas and the absolute temperature. As the temperature decreases and the pressure remains constant, the volume of the gas decreases.
The other statements are not true:
-The number of moles of gas decreases as it is cooled.
-The pressure of the gas decreases as it is cooled.
-The number of gas molecules decreases as it is cooled.
As long as the volume is kept constant and the temperature is lowered, the pressure of the gas decreases.
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At a certain temperature the vapor pressure of pure chloroform (CHCI3) is measured to be 264. torr. Suppose a solution is prepared by mixing 82.9 g of chloroform and 62.9 g of heptane (C7H16). Calculate the partial pressure of chloroform vapor above this solution. Round your answer to 3 significant digits.
To determine the partial pressure of chloroform vapor, we can use Raoult's law. According to Raoult's law, a component's partial pressure in a solution is equal to its vapor pressure.
What does Raoult's law entail?
According to Raoult's law, a component's partial vapor pressure in a solution is equal to the vapor pressure of the pure component times the mole fraction present in the solution. Ideal solutions, which are those made up of volatile, unrelated molecules, are those that fall under the purview of this law. The total of the partial vapor pressures of the solution's constituent parts determines its vapor pressure. The ideal solution theory, which is based on Raoult's law, states that the vaporTo learn more about Raoult's law
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A 13.0 ml sample of an acid requires 37,3 ml of 0.303N NaOH for neutralization. Calculate the normality of the acid.
The amount of 0.303N NaOH needed to neutralize a 13.0 ml sample of acid is 37,3 ml. Acid is 0.823N normal, according to the standard.
Explain about the neutralization.The idea of neutralization, according to which an acid reacts with a base to create salt and water. By comparing the molarity of the base to the amount of base needed for neutralization, it is possible to calculate the molarity of the acid. Once the molarity and the acid's valence (or charge) have been multiplied, the acid's normalcy can be determined.
By deducting the volume of NaOH (37.3 ml) from the volume of the acid sample in Step 1, you can calculate the amount of acid that was utilized in the neutralization procedure (13.0 ml).
Consequently, 13.0 ml to 37.3 ml
= -24.3 ml
Use the equation moles = normality x volume to determine the number of moles of acid that were used in the process.
Consequently, moles equal 0.303N x -24.3 ml.
= -7.33 moles
Determine the acid's normality by multiplying the volume by the formula normalcy = moles.
As a result: normalcy = -7.33 moles / 13.0 ml
= -0.823N
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the atomic mass unit is a standardized unit defined as exactly 112 the mass of a(n) -12 atom. the atomic mass (weight) of any element is determined relative to this standard and is not a whole number, since it is a(n) of the masses of its naturally occurring isotopes.
The atomic mass of an element is the total number of protons and the neutrons in a particular atom of the element.
The atomic mass unit is a standardized unit and defined as the exactly 1 / 12 the mass of a carbon -12 atom. The atomic mass or weight of any element is determined by the relative to this standard and is not a whole number, since it is an average of the masses of its naturally occurring isotopes.
The atomic mass of an element is total number of protons and the neutrons. The atomic mass is average weight of all the isotopes of that element.
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How do I fill out this chart?
What following actions are permitted in balancing a chemical equation?
-Multiplying all coefficients by a common factor
- Inserting coefficients and front of formulas of reactants and products
The actions that aren't permitted in balancing a chemical equation is given below.
What is chemical equation?A chemical equation is an expression that represents the chemical reaction between two or more substances. It consists of the chemical formulas of the reactants (the starting materials) and the products (the end result of the reaction), along with the physical states of the reactants and products (solid, liquid, gas, etc.) and the symbols that denote the type of reaction that is taking place (e.g. double arrow for a reversible reaction). The number of atoms of each element in the reactants and products must be the same on both sides of the equation.
Multiplying all coefficients by a common factor
- Inserting coefficients and front of formulas of reactants and products to balance the equation
- Adding coefficients in front of formulas of reactants and products to balance the equation
- Ignoring common elements in the equation
- Using the law of conservation of mass to balance the equation
- Combining like terms on both the reactants and products side of the equation
- Splitting a compound into its constituent elements with their respective coefficients
- Cancelling out any coefficients that are equal on both sides of the equation
- Rearranging terms to obtain the desired balance
- Substituting coefficients until the equation is balanced
- Checking the equation after balancing to verify that all atoms are balanced on both sides of the equation.
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2K3N + 3CaCl2 → 6KCl + Ca3N2
1 mol K3N = 131.301 g K3N
1 mol CaCl2 = 110.984 g CaCl2
1 mol KCl = 74.551 g KCl
1 mol Ca3N2 = 148.248 g Ca3N2
How many grams of CaCl2 would it take to make 1.5 moles of KCl?
Which of the following compounds are the same?
Compound 1: 1.10 g of H and 8.90 g of O.
Compound 2: 4.95 g of H and 40.05 g of O.
Compound 3: 2.10 g of H and 32.90 g of O.
Compound 4: 4.70 g of H and 60.30 g of O
A. Compounds 1 and 4
B. Compounds 2 and 4
C. Compounds 2 and 3
D. Compounds 1 and 2
The following includes compounds 2 and 4 that are identical. In chemistry, a compound is a substance that is produced when two or more distinct chemical elements are combined in a particular order.
what are the different types of compounds?Salts and molecular compounds are the two main categories of chemicals. Covalent bonds are the means through which atoms in molecular compounds are joined. It is connected by ionic bonds in salts. All compounds are composed of these two different sorts of bonds.
Compounds are what kind of things?(KOM-pownd) A substance in science that is created through the chemical joining of two or more distinct elements Table salt (NaCl), which is a compound comprised of the elements sodium and chloride, and water (H2O), which are examples of compounds.
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This chemical reaction follows the law of conservation of mass
Cao(s) + CO₂(g) - CaCO3(s)
How much CaCO3 will be formed if 2.2 grams of CaO are used for this reaction? Assume there are enough reactants to complete the reaction. The final answer should be rounded to one
place after the decimal point
A 1.1 grams
B. 2.2 grams
C 3.9 grams
D 4.3grams
pure substance x decomposes according to the equation above. which of the following graphs indicates that the rate of decomposition is second order in x ?
The decompositionrate is second order on x, as shown by a positive (1/x) L—> R graph..
In Graph 1, two molecules of NO react for every molecule of O2 that reacts because O2 consumption is half that of NO consumption. H2(g)+2ICl(g)2HCl(g)+I2(g) is the overall reaction, and rate=k is the percentage law for step 2. [HI][ICl]rate=k[HI][ICl]. The following is the empirically discovered rate rule for ozone depletion: k [O3] = rate. A system must be in accordance with the rate law discovered through decomposition. As a result, in the zero-order reactions, the rate is free of the reactant concentration and the unit of rate and rate constant, which are mol/L/time, are equal.
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select all the reactions in which the oxidation numbers of the reactant species change, that is, are redox reactions.
The redox reactions are: a) 7O₂ (g) + 2C₂H₆ (l) → 4CO₂ (g) + 6H₂O (l) & c) Cu(OH)₂ (s) + 2HClO₄ (aq) → Cu(ClO₄)₂ (aq) + H₂O (l).
a) 7O₂ (g) + 2C₂H₆ (l) → 4CO₂ (g) + 6H₂O (l) is a redox reaction. Oxygen is gaining electrons and becoming reduced (from O₂ to H₂O) while the carbon in the C₂H₆ is losing electrons and becoming oxidized (from C₂H₆ to CO₂).
b) Co (s) + Cl₂ (g) → CoCl₂ (s) is not a redox reaction, as the oxidation numbers of cobalt and chlorine remain the same on both sides of the equation.
c) c) Cu(OH)₂ (s) + 2HClO₄ (aq) → Cu(ClO₄)₂ (aq) + H₂O (l) is a redox reaction. Copper is losing electrons and becoming oxidized (from Cu(OH)₂ to Cu(ClO₄)₂) while the chlorine in the HClO₄ is gaining electrons and becoming reduced (from ClO₄ to Cl).
d) ZnBr₂ (aq) + 2KOH (aq) → Zn(OH)₂ (s) + 2KBr (aq) is a redox reaction. Zinc is losing electrons and becoming oxidized (from ZnBr₂ to Zn(OH)₂) while the Hydrogen in the KOH is gaining electrons and becoming reduced (from KOH to KBr).
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The complete question is:
Select all the reactions in which the oxidation numbers of the reactant species change, that is, are redox reactions.
a) 7O₂ (g) + 2C₂H₆ (l) → 4CO₂ (g) + 6H₂O (l)
b) Co (s) + Cl₂ (g) → CoCl₂ (s)
c) Cu(OH)₂ (s) + 2HClO₄ (aq) → Cu(ClO₄)₂ (aq) + H₂O (l)
d) ZnBr₂ (aq) + 2KOH (aq) → Zn(OH)₂ (s) + 2KBr (aq)
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Factors that affect the rate of a chemical reaction include which of the following? I. Frequency of collisions of reactant particles II. Kinetic energy of collisions of reactant particles III. Orientation of reactant particles during collisions a. I and Il only 0 b. I, Il, and Ill c. Il and IIl only d. Il only e. I and Ill only
Some elements that impact a chemical reaction's pace are collisions between reactant particles have kinetic energy.
What are the factors affecting the chemical reaction?Two or more molecules colliding with the proper energy and orientation to create a new chemical compound is known as a chemical reaction. It should be possible to maintain the reaction's whole mass. Chemical reactions come in a wide variety of forms, such as double displacement reactions and combination reactions.
There are a multitude of variables that might influence a reaction's rate, and one of these is the kinetic energy of reactant particle collisions. Chemical reaction rates are inversely correlated with reaction rates. Five variables have been identified as having an impact on chemical reaction rates: the reactants' state of subdivision (one big lump versus many little particles), the chemical composition of the reacting substances,
Therefore the correct answer is option d ) Il only
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2 BaO2(s) ⇄ 2 BaO(s) + O2(g)
ΔH° = 162 kJ/molrxn
A sealed rigid vessel contains BaO2(s) in equilibrium with BaO(s) and O2(g) as represented by the equation above.
Which of the following changes will increase the amount of BaO2(s) in the vessel?
(A)Removing a small amount of O2(g)
(B) Removing a small amount of BaO(s)
(C) Adding He gas to the vessel
(D) Lowering the temperature
'Removing a small amount of O2(g)' will increase the amount of BaO2(s) in the vessel.
What do you mean by a vessel?
In chemistry, a vessel is a container, typically made of glass, that is used to hold and heat liquids or solids in a chemical reaction. It is an essential piece of laboratory equipment, and it is used to safely and accurately measure, mix, and store materials. Vessels come in many different forms and sizes, and are used for everything from simple mixing applications to complex, high-temperature reactions.
When oxygen is removed from the vessel, the equilibrium of the reaction will shift in favor of the formation of BaO2(s). This is because the reaction is exothermic and the decrease in O2(g) will reduce the amount of energy available for the reaction to occur, thus favoring the formation of BaO2(s).
Hence, option A is correct.
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Zinc reacts with hydrochloric acid according to the following equation: Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g) In a certain experiment, a 3.77 g sample of impure zinc is reacted with excess hydrochloric acid. If 1.09 L of H2 gas is collected at STP, what percentage of the original sample was zinc? Assume that the impurities do not react with HCl.
Answer:
approximately 69.24% of the original sample was zinc.
Explanation:
According to the equation, 1 mole of zinc reacts with 2 moles of HCl to produce 1 mole of ZnCl2 and 1 mole of H2.
We can use the Ideal Gas Law PV = nRT to find out the number of moles of H2 produced. Given that the pressure P = 1atm and temperature T = 273K (STP).
n = PV / RT = (1.09L) * (1atm) / (8.314J/mol * 273K) = 0.04 moles
Now we know that 0.04 moles of H2 is produced, we can use the balanced equation to find out the number of moles of zinc that reacted.
0.04 moles H2 is produced for every 1 mole of Zn.
thus 0.04 moles of zinc reacted.
The mass of zinc that reacted can be calculated by multiplying the number of moles by the molar mass of zinc (65.38g/mol)
0.04 moles * 65.38 g/mol = 2.6152 g
Now we can calculate the percentage of zinc in the original sample using the following equation:
% zinc = (mass of zinc reacted / mass of original sample) * 100
= (2.6152g / 3.77g) * 100 = 69.24%
So approximately 69.24% of the original sample was zinc.
A prescription medication requires 8.00 mg per kg of body weight . Express your answer to three significant figures.
A prescription medication requires 8.00 mg per kg of body weight . The 0.017 grams is required per pound of the body weight. 1.7 × 10⁻² grams is required per pound of the body weight.
What is significant figure ?The term significant figure is defined as the number of digits in a value, often a measurement, that contribute to the degree of accuracy of the value.
We are given:
Medication requirement = 5.98 mg/kg
To convert the given amount in grams per pounds, we use the conversion factor:
1 kg = 2.20462 lb
1 g = 1000 mg
Converting the value into grams per pounds, we get:
= 8 mg / kg × 1g / 1000mg × 2.20462 lb / 1kg
= 0.017 grams
Thus, 1.7 × 10⁻² grams is required per pound of the body weight.
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rutherford's gold foil experiment was very important in developing the nuclear model of the atom. which of the following statements correctly describe the observations made and the implications of each for atomic structure? select all that apply. Most α particles passed straight through the foil, implying that the atom consists largely of empty space.-A few α particles showed major deflections, indicating the presence of a dense central core within the atom.
Experiments with cathode rays led Thomson to propose that the electron was a negatively charged particle.
What is meant by cathode ?
The positive terminal of a battery or other source of electrical energy via which electrons exit and the cathode, negative terminal or electrode through which they enter a direct current load, such as an electrolytic cell or an electron tube.The anode is the negative or reducing electrode that undergoes electrochemical reactions and delivers electrons to the external circuit while oxidising.The positive or oxidising electrode known as the cathode is decreased during the electrochemical process after receiving electrons from the external circuit.An x-ray tube's cathode serves to expel the electrons from the circuit and concentrate them in a beam on the anode's focal spot.To learn more about cathode refer to
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ions of which metal would be excpected to have the strongest interactions with water molecules in aqueous solutions
In aqueous solutions, ions of metals that are highly reactive and have a high charge density (such as those in the Group 1 or Group 2 of the periodic table) would be expected to have the strongest interactions with water molecules.
These metals have a high tendency to lose electrons and form cations, which can interact with the polar water molecules through electrostatic forces, such as hydrogen bonding.For example, ions of sodium (Na+), potassium (K+), calcium (Ca2+), and magnesium (Mg2+) are highly reactive and have high charge densities, and they would be expected to have strong interactions with water molecules in aqueous solutions. These ions are easily dissolved in water and form hydrated ions, which are surrounded by a "shell" of water molecules.In general, ions with a high charge to radius ratio will form stronger bonds with water molecules, so positively charged ions from the left side of the periodic table tend to be more hydrated.
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two tablets of the antibiotic isoniazid were crushed, dissolved, and homogenized in 100 ml of water. the solution was then assayed using redox titration. given the equation below, if 12.16 ml of 0.020 m kbro3 was required to reach the endpoint, how many mg of isoniazid were present in each isoniazid tablet? (note: mw of isoniazid
Dosage for an isoniazid and rifapentine combo regimen administered in 12 once-weekly doses while being closely monitored for the treatment of latent Mycobacterium tuberculosis infection. There are 100 mg and 300 mg tablets available of isoniazid (INH).
How much Isoniazid is the MG?Depending on the schedule that your doctor determines for you, the typical dose is 10 to 20 mg per kg (4.5 to 9.1 mg per pound) of body weight, up to 300 mg, once a day; or 20 to 40 mg per kg (9.1 to 18.2 mg per pound) of body weight, up to 900 mg, twice a week; or three times a week.Dosage for an isoniazid and rifapentine combo regimen administered in 12 once-weekly doses while being closely monitored for the treatment of latent Mycobacterium tuberculosis infection. There are 100 mg and 300 mg tablets available of isoniazid (INH).To learn more about isoniazid refer to:
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Step 1:H2(g)+ICl(g)→HI(g)+HCl(g)(slow)Step 2:HI(g)+ICl(g)→HCl(g)+I2(g)(fast)Which of the following represents a rate law for the overall reaction that is consistent with the proposed mechanism?
The rate law that is consistent with the proposed mechanism is [-d[H2]/dt = k[H2][ICl].
The overall reaction is the sum of the two steps, which is:
H2(g) + 2ICl(g) → 2HCl(g) + I2(g)
To determine the rate law for the overall reaction, we need to consider the rate-determining step, which is the step that has the slowest rate. In this case, it is step 1.
The rate-determining step is H2(g) + ICl(g) → HI(g) + HCl(g)
The rate law for this step is -d[H2]/dt = k[H2][ICl]
Since step 2 is fast, we can assume that the concentration of HI is always in equilibrium with the concentrations of H2 and ICl
Therefore, the rate law for the overall reaction is -d[H2]/dt = k[H2][ICl]
So, the rate law that is consistent with the proposed mechanism is [-d[H2]/dt = k[H2][ICl]
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