The element krypton is a noble gas, meaning it is chemically inert and does not typically react with other elements.
What do you mean by noble gas?
Noble gases are a group of chemical elements in the periodic table that have very low reactivity and stable properties. They have eight valence electrons in their outermost electron shell, which makes them very stable and unreactive. The six noble gases are helium, neon, argon, krypton, xenon, and radon.
a. A=82, n=46
b. A=84, n=48
e. A=83, n=47
We can calculate the number of protons in the above options by subtracting the number of neutrons from the mass number. Kr has an atomic number of 36. As a result, the isotopes listed above are correct. These are the isotopes Kr-82, Kr-83, and Kr-84.
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Perform each of the following operations and report your final answer with the correct number of significant figures and in scientific notation. Explain(65.0×1.07)/14=170-3.33+24.9 =99.670+24.52-0.3=
The correct number of significant figures for (65.0×1.07)/14 is 2, for 170-3.33+24.9 is 3 and 99.670+24.52-0.3 is 4.
The critical figures of a number are the crucial or significant digits that accurately convey the meaning of that number. 6.658, for instance, has four significant digits. These huge amounts give the numbers accuracy. Additionally, they are known as significant digits. The 2, 4, 5, and last 0 of the number 0.2540 are significant. Additionally significant are the zeros before and after numerals and the decimal point. Exponential digits are not significant in scientific notation; the three significant digits in 1.12106 are 1, 1, and 2.
Given the various operations to be carried out as:
(a) (65.0×1.07)/14 = 4.9678 = 5.0
The number of significant figures = 2
(b) 170-3.33+24.9 = 191.57 = 192
The number of significant figures = 3
(c) 99.670+24.52-0.3 = 123.89 = 123.9
The number of significant figures = 4
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Use the following table of bond energies to calculate the molar enthalpy of combustion (in kJ/mol) of acetylene (C₂H₂) gas in oxygen, based on the following chemical equation:
C₂H₂(g) + 2.5O₂(g) → 2CO₂(g) + H₂O(g)
The heat of combustion of the reaction is -859 kJ/mol.
What is the enthalpy of combustion?When we talk about the enthalpy of combustion, we mean the heat that is required in order to burn up the compound in the presence of oxygen. Recall that the heat of reaction is gotten by the use of the formula;
Sum of the bond energies of the reactants - Sum of the bond energies of the products
As such, we have;
[(1 * 835) + (2 * 411)] - [(2 * 799) + (2* 459)]
= (835 + 822) - (1598 + 918)
=1657 - 2516
= -859 kJ/mol
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medication order reads: ampicillin 500 mg im q 6 hrs. supply on hand: 1 gm vial, use label below for further information. patient's weight 136 lbs . give ml
ampicillin 500 mg im q 6 hrs. supply on hand: 1 gm vial. the medication order is to give 3.0845 ml of ampicillin every
To calculate the amount of ampicillin to administer, you will need to first convert the patient's weight from pounds to kilograms. One kilogram is equal to 2.20462 pounds. So, 136 pounds is equal to 61.69 kilograms.
Next, the medication order states that the patient should receive 500 mg of ampicillin every 6 hours. To calculate the daily dosage, we can multiply the 500 mg dose by the number of doses per day (24 hours / 6 hours = 4 doses per day) which gives us 2000 mg/day.Now, we can use the patient's weight to determine the appropriate dosage per weight. The recommended dosage of ampicillin is 25-50 mg/kg/day. In this case, we will use 50mg/kg/day. So we can calculate the dosage as 50mg/kg/day * 61.69 kg = 3084.5 mg/day. To convert the dosage in mg to ml, we can use the information on the vial. The vial contains 1 gm of ampicillin, which is equal to 1000mg. So we can divide the dosage in mg by the concentration of the vial.3084.5mg/1000mg = 3.0845ml. Therefore the medication order is to give 3.0845 ml of ampicillin every.
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Dunes can be up to 300
meters tall! What is a
dune?
A. what is left behind when the
wind blows all of the sand away
B. a mound of sand piled up by
the wind
C. a very large cave
D. a very common occurrence in
wet and rainy areas
Answer:
B. a mound of sand piled up by the wind.
Explanation:
It is option B because a dune is a natural feature formed by the wind blowing sand particles and piling them up in a specific area. The wind can shape the dune and cause it to grow taller, sometimes reaching heights of 300 meters or more. Dunes are not caused by the wind blowing sand away, as stated in option A, nor are they found in wet and rainy areas, as stated in option D, they are typically found in desert regions or along coastlines. It is not a cave as stated in option C.
Multiply these in scientific notation
(4.1 × 10°) x (3 x 10-6)
Oa
7.1 x103
Ob
1.23 x 102
O c
7.1 x103
O
d
3.21 x 102
The result of the multiplication of given number in scientific notation is 1.23 × 10⁻⁵. The power of 10 is added in the muiltipication.
What is scientific notation ?Scientific notation is a standard and scientific way of representing numbers. In scientific notation, the numbers are converted with powers of ten. For example a number 5 can be written as 5 × 10°. Similarly 500 can be written as 5 × 10².
The first term in the scientific notation 4.1 × 10° = 4.1 . since 10° = 1.
second terms, 3 × 10 ⁻⁶. Multiply it with 4.1
= 4.1 × 3 × 10 ⁻⁶ = 12.3 × 10 ⁻⁶ = 1.23 × 10⁻⁵.
Therefore, the final answer in scientific notation is written as: 1.23 × 10⁻⁵.The power ten is increased when we move the decimal point to the left.
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Which of the following is an example of water in a liquid state?
Question 6 options:
Steam
Snow
Rain
Ice
Using molecular formulas, write down a balanced molecular equation for the reaction of methyl salicylate with sodium hydroxide to give the sodium salt of salicylic acid. (You will need to figure out the other product
The reaction of methyl salicylate with sodium hydroxide gives the sodium salt of salicylic acid called as sodium salicylate which can be represented as: C7H6O3 + NaOH -> C7H5O3Na + H+
With the chemical formula C7H6O3, salicylic acid is an inorganic substance that is a subclass of phenolic acid and beta-hydroxy acid (BHA). Aspirin is one of the main products made from salicylic acid, which is also known as ortho-hydroxybenzoic acid. It is a crystalline solid with a white hue that is used in the creation of numerous pharmaceutical medicines. Salicylic acid, an organic acid, dissociates to lose a proton from the carboxylic acid functional group in an aqueous solution. It appears in nature as crystals of an organic acid that are transparent and colorless. This compound's salt and ester derivatives, sometimes referred to as salicylates, are frequently utilized in organic chemistry. It combines with sodium hydroxide to produce sodium salicylate.
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Which change in energy is taking place in this image ?
Answer:
Pretty sure it's B
Explanation:
What is the temperature (in K) of 16.45
moles of methane gas in a 70.7 L
container at 3,557 torr?
At 3,557 torr, 16.45 moles of methane gas are at a temperature of T=17.15 K in a 70.7 L container.
According to the ideal gas law: PV=nRT, where R=0.082 and T is temperature in Kelvin (K). P is pressure, V is volume, n is the amount in moles.
(4.68)*(4.95)=(16.45)*(0.0821)*
T=17.15, therefore calculate it.
What's called gas?An object that is in the gaseous, or vaporous, condition of matter, is referred to as a gas. When referring to material with characteristics of a gaseous substance, the word "gas" can also refer to the condition itself. Along with liquid, solid, and plasma, gases are one of the four natural states of matter. The shape or volume of a gas can change.
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Answer:
245
Explanation:
everyone needs to chill don't answer if you can't get it right it wastes you time and others as well not trying be a hater but its true
Your lab partner did not take careful notes during today's chemistry experiment. You see these numbers written without labels: 37.3 grams, 40 grams, 93.3% before asking your partner, you decide to predict which number is the predicted yield, the actual yield, and the percent yield. Justify your answer. Make a list of the factors that will increase the reaction rate of a chemical reaction.
Based on the given information, it is not possible to accurately predict which number is the predicted yield, the actual yield, and the percent yield without additional information or context. The percent yield is calculated by comparing the actual yield to the predicted yield, which are both typically measured in grams or moles.
The list of the factors that will increase the reaction rate of a chemical reaction are
Increasing the temperature Increasing the concentration of reactants Increasing the surface area of the reactants: What is chemical reaction?The Factors that can increase the reaction rate of a chemical reaction include:
Increasing the temperature: as temperature increases, the kinetic energy of the reactant particles increases, making it more likely for them to collide and react. Increasing the concentration of reactants: as the concentration of reactants increases, the number of reactant particles in a given space increases, making it more likely for them to collide and react.Lastly, Increasing the surface area of the reactants: as the surface area of the reactants increases, the number of reactant particles in contact with each other increases, making it more likely for them to collide and react.
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Elements in the same
column (group/family) are
Elements in the same group or family in the periodic table are called congeners. For Example, the congeners in Group 1 are Sodium, Potassioum and Lithium.
Elements in the same group or family in the periodic table have the same number of valence shell electrons in their outermost shell. Therefore, they share some of the same physical and chemical properties. They may also share their reactivity properties. When same physical and chemical properties are present in a group, it is called a trend. When an element deviates from a trend, it is called an exception.
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for the following unbalanced chemical equation, suppose that exactly 5.05 g of each reactant is taken. determine which reactant is limiting, and calculate what mass of each product is expected (assuming that the limiting reactant is completely consumed). enter the formula for the limiting reactant.
We must count the moles of each reactant and divide this amount by the reactant's psychometric coefficient in order to identify the limiting reactant.
The limiting reactant would have the lowest value.
S (32 g/mol), Divide the amount of moles of S (5/32 = 0.15625) by the psychometric factor, 1 to get 0.15625.
For H2SO4, Divide the number of moles of H2SO4 by the psychometric coefficient,2 which comes to 0.02551.
Therefore the limiting reactant is H2SO4.
Mass of each product once the limiting reactant has been completely used up.
Mass of H2O = 0.0510 mol H2SO4 * (2 mol H2O/ 2 mol H2SO4) * (18 g H2O/ 1 mol H2O) * 0.918 mol H2O = 0.918 g H2O.
Mass of SO2 is equal to 0.0510 mol H2SO4 * (3 mol SO2/ 2 mol H2SO4) * (64 g SO2/ 1 mol SO2) * (4.896 g).
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Many different arrangements of electrons in an atom (configurations) are possible. One configuration will always be lowest in energy. This most stable configuration of an atoms electrons is called the ground state We can identify the ground state of most atoms by determining if a configuration obeys all three of the basic ground state rules (auf bau principle, Hund's rule, and the Pauli Exclusion principle). For each of the following configurations, indicate if the configuration is a ground state or which of the three ground state rules it violates a. 1s 2s 2p 3d 4p 1s 2s 2p 4s 3d 4p 2p 1s 2s 3s 3p 4s 4p configuration (a) I Choose l configuration b) Choose ] configuration (c) Choose l
Configuration (a) - Ground state Configuration (b) - Violates Hund's Rule Configuration (c) - Violates Pauli Exclusion Principle.
What is configuration?Configuration is the process of setting up and fine-tuning a system to meet a user's specific needs. It is a process of organizing and customizing a system or device to meet the specific requirements of its user. This process is often used to customize a device or system to fit the user’s individual preferences, such as setting up a laptop for a specific user or configuring a complex network for a business. Configuration includes installing and configuring hardware, software, and other settings. It also involves troubleshooting any issues that may arise during the process.
Configuration (a) is a ground state. It obeys all three of the ground state rules.
Configuration (b) violates the Aufbau principle, as electrons should fill the lowest available energy levels first.
Configuration (c) violates the Pauli Exclusion principle, as each orbit can only contain two electrons with opposite spin.
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From 23g of ethanol are obtained,36g ethylethanoate by esterification with ethanoic acid in the presence of concentrated
In the presence of concentrated sulphuric acid as a catalyst, ethanol interacts with ethanol to form the ester, ethyl ethanoate. The response is gradual and reversible.
How does the mechanism work?In the presence of concentrated sulphuric acid as a catalyst, ethanol interacts with ethanol to form the ester, ethyl ethanoate. The response is delayed and can be reversed. To reduce the possibility of a reverse reaction, the ester is distilled out as soon as it is generated.
Because it makes the process less unclear, all of the stages in the mechanism below are depicted as one-way reactions. The reverse reaction is performed so differently that it influences how the mechanism is stated. If you’re interested, there’s a link to ester hydrolysis farther down the page.
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calculate the density of 3.00 x 10^2 gram object that has a volume of 48.5mL. Enter your answer in the provided box
Answer:
6.22 g/mL
Explanation:
To calculate the density of an object, you divide its mass by its volume (d = m/v).
In this case, the mass of the object is 3.00 x 10^2 grams and the volume is 48.5 mL.
So the density = (mass (g)) / (volume (mL)) = (3.00 x 10^2) / (48.5) = 6.22 g/mL
Circle the letter of the phrase that completes this sentence correctly. Thenumber of percent values in the percent composition of a compound isa. half as many as there are different elements in the compound.b. as many as there are different elements in the compound.c. twice as many as there are different elements in the compound.
The number of grams of an element divided by the mass in grams of the compound, then multiplied by 100%, is the percent by mass of the element in the compound.
How do you figure out how many grams of an element are included in a given quantity of a compound?Divide each element's atomic weight (found in the periodic table) by the quantity of that element's atoms in the compound. 3. Add up the totals, and then follow the number with the units of grams/mole. You can simply round the atomic weights and the molar mass to the nearest 0.1 g/mole for many (but not all) issues.The number of grams of an element divided by the mass in grams of the compound, then multiplied by 100%, is the percent by mass of the element in the compound.To learn more about percent refer to:
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What is the molarity of a solution containing 10g of NaOH in 500 mL of the solution?
a. 0.25 mol L^-1
b. 0.75 mol L^-1
c. 0.5 mol L^-1
d. 1.25 mol L^-1
The molarity of a solution is defined as the number of moles of solute per liter of solvent. To find the molarity of a solution containing 10g of NaOH in 500 mL of the solution, we can use the formula:
Molarity = moles of solute / liters of solvent
First we need to convert the mass of NaOH to moles. The molar mass of NaOH is 40 g/mol.
moles = mass / molar mass = 10g / 40 g/mol = 0.25 mol
Then we can calculate the molarity by using the formula above
Molarity = moles of solute / liters of solvent = 0.25 mol / (0.5 L) = 0.5 mol L^-1
The answer is c. 0.5 mol L^-1
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polar molecules have attractive dipole-dipole interactions when the dipoles are arranged in which of the following geometries?
When the dipoles are organized in head-to-tail; antiparallel and side-to-side geometries, polar molecules exhibit attractive dipole-dipole interactions. molecules that are polar.
Because PCl₃ is polar, dipole-dipole attractions will occur. Nonpolar F₂, ionic FeCl₂, and nonpolar CO₂. Dipoles develop in amplitude as covalent bonds get more polar, and hence dipole-dipole attractions expand in size. Dipole-dipole interactions occur when partial charges produced inside one molecule are attracted to an opposing partial charge in a neighboring molecule. Polar molecules align so that the positive end of one molecule interacts with the negative end of another.
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The actual question is:
Polar molecules have attractive dipole-dipole interactions when the dipoles are arranged in which of the following geometries?(Select all that apply)
head-to-tail; side-to-side; antiparallel; diagonal; round and round
Ethene (C2H4) reacts with halogens (X2) by the following reaction:
C2H4(g) + X2 == C2H4X2(g)
The following figures represent the concentrations at equilibrium at the same temperature when X2 is Cl2 (green), Br2 (brown), and I2 (purple). List the equilibria from smallest to largest equilibrium constant. [Section 15.3]
The correct order for equilibrium constant = K₁ > K₂ >K₃
What is meant by equilibrium?
Alkene ethene and elemental halogen X2 are both used. Halogenation reaction is the name given to the reaction between an alkene and a halogen.The electrophilic addition mechanism is used in this reaction. Elctrophile, X+, is produced in this reaction by elemental halogen (X2).The double bond in the alkene draws this electrophile and binds it to it.Electrophile addition causes the production of a carbocation intermediate.Nucleophile attacks this positive carbon, leading to the production of a 1,2-di halide alkane as a consequence.Ethene (C2H4) and halogen (X2) combine to form 1,2 - dihalide ethane (C2H4X2). The graphic depicts the reaction of halogen (X2) with chlorine (Cl2).On applying this concept in figures :
Given : Green = Cl₂ Brown = Br₂ Purple = I₂ Grey = Ethene
Grey + Green = 1,2- dihalide ethane
a) Number of Cl₂(green ) = 2
number of ethane ( grey ) = 2
Number of 1,2-dichloride alkane( grey + green ) = 8
Plugging these number in equilibrium constant expression :
[tex]k_{1} = 8/ 2*2=8/4=2[/tex]
Hence K₁ for ethene + chlorine = 2
b) Number of Br₂(brown ) = 4
number of ethane ( grey ) = 4
Number of 1,2-dibromide alkane( grey + brown ) = 6
On plugging these values in K expression as :
[tex]K_{2} = 6/4*4=6/16=0.0612[/tex]
Hence K₂ for ethen + Bromine = 0.375
c) Number of I₂(purple ) = 7
number of ethane ( grey ) = 7
Number of 1,2-diiodide alkane( grey + purple ) = 3
On plugging values in K expression as:
[tex]K_{3} = 3/7*7=3/49=0.0612[/tex]
Hence K₃ for ethene + Iodine = 0.0612
So , the order of equilibrium constant (K) from largest to smallest :
K₃ = 0.0612 K₂ = 0.375 K₁= 2
K₁ > K₂ >K₃
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There are 12 inches in 1 foot. which of the following conversion factors express this relationship correctly? select all that apply.
12 in/1 ft
1 in x 12 ft
1 ft/12 in
1/(1 in x 12 ft)
Answer:
12 in/1 ft and 1 ft/12 in
Explanation:
The conversion factor means the equal value of the expression.
Here in this case, "there are 12 inches in 1 foot is the statement" which means one foot contains 12 inches.
In the given options, 12 in/1 ft means 12 inches per 1 foot, and 1ft/ 12in means 1 foot for 12 inches which are technically the same.
There is a formula that supports this statement. That is
Conversion factor = Required yield / Recipe yield
or
Conversion factor= What you need/ What you have
Hence both 12in/1 ft and 1ft/ 12 in are the correct answers.
Using the following reaction
A + 2B = 3C + D + heat
If D is removed, what happens to A?
Concentration
of A increases
Concentration
of A decreases
A's concentration falls if D is removed. In this scenario, the equilibrium position will change, causing A's concentration to once again drop as a result of its reaction with B to produce more C and D.
What is the Le Chatelier creed?The following is the Le Chatelier principle: A shift in the equilibrium's location cancels out the impact of a change in one of the variables that define an equilibrium in a system.
The KP equation is what?The broad statement: Kp = Kc(RT) (RT) Where n = moles of gaseous products - moles of gaseous reactants, one can derive n. Pure solids and pure liquids are not given concentration words.
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the coinage metals, cu, ag, and au, all lie in one column of the periodic table. consider ag. an atom of ag will have a certain ground state electron configuration according to the aufbau principle. the outermost electrons in ag will have the configuration select all that apply
The electron configuration for silver (Ag) is based upon the place meant of silver in the fifth row of the periodic table in the 11th column of the periodic table or the 9th column of the transition metal or d block. Therefore th electron configuration for silver must end as [tex]4d^{9}[/tex].
What is meant by electron?
Unattached or attached to an atom, an electron is a negatively charged subatomic particle (not bound).One of the three main types of particles within an atom is an electron that is bonded to it; the other two are protons and neutrons.An atom's nucleus is made up of electrons, protons, and neutrons.The exterior of the nucleus is surrounded by negatively charged electrons in orbit.It can be challenging for scientists to monitor them since they rotate so quickly.They are the tiniest particles in an atom and are drawn to the protons' positive charges; one proton can hold 2000 of them.[tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{6} 5s^{2} 4d^{9}[/tex]
This notation can be written in core notation or noble gas notation by replacing the [tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{6}[/tex] with the noble gas [Kr].
[Kr] [tex]5s^{2} 4d^{9}[/tex]
For some of the transition metals they will actually transfer an s electron to complete the d orbital, making silver,
[Kr] [tex]5s^{1} 4d^{10}[/tex]
I hope this was helpful.
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List the properties of acids and bases. Which of the properties would you use to safely test whether an unknown substance was an acid or a base?
Acids taste sour, react with metals,
and turn blue litmus paper red. Bases
taste bitter, feel slippery, and turn red
litmus paper blue. Use of litmus paper.
Acids are chemical substances that are defined by a sour taste in an aqueous medium.
These acids may have the tendency to turn into blue litmus red. On the other side, bases are chemical substances that are defined by a bitter taste and are slippery to the touch.
There are some bases that are soluble in water, while others are not, there are two types of litmus paper that are available that can be used to identify acids and bases:
They are known as Red litmus paper and blue litmus paper.
A blue litmus paper changes into red under acidic conditions and red litmus paper changes into blue under basic or alkaline conditions. These chemical properties are very useful in identifying substances.
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F and G react together. When the concentration of F is tripled and the concentration of G remains constant, there is a nine-fold increase in the rate of the reaction. What is the order of the reaction with respect to F?
There is a nine-fold rise in the pace of the reaction when the concentration of F is tripled but the concentration of G stays the same. The response is in the second order relative to F.
What happens to rate of reaction if concentration is tripled?If you increase one reactant's concentration in a third order reaction involving two reactants by three times, the rate rises by a factor of three. If a reactant is first order, its concentration will cause a doubling in the reaction's rate; a tripling in the reaction's rate, etc. If a reactant is third order, its rate of reaction will increase by a factor of 8 when its concentration is doubled (23 = 8), etc.
The concentration of a reactant does not impact the rate. The rate remains unchanged even if the concentration is doubled. The given rate law needs to be written first. The concentrations of A and B will be increased by three times each after that.
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Which of the following pieces of information is/are necessary to calculate the molar mass of a compound? Select all that apply.
The atomic masses of each of the elements that make up the compound is the following pieces of information are necessary to calculate the molar mass of a compound.
What is mass?
It is possible to quantify inertia, a fundamental property of all matter. The resistance a body of matter offers to a change in its speed or position brought on by the application of a force is effectively what it is.
What is molar mass ?
To calculate the molar mass of a compound, it is frequently necessary to sum the qualitative atomic masses (in g/mol) of each individual atom. Titanium is a good example, with a mass of 47.88 amu (or 47.88 g/mol). In 47.88 kilos of the metal, or 6.022 x 1023 atoms, there are one mole of titanium.
Therefore, atomic masses of each of the elements that make up the compound is the following pieces of information are necessary to calculate the molar mass of a compound.
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arrange the molecules by the strength of the london (dispersion) force interactions between molecules.
The correct order is iodine>bromine> chlorine. As we move down the halogens the London dispersion forces increase.
London dispersion forces are the intermolecular forces that hold the molecules together. It is one of the van der Waal forces and is sometimes known as induced dipole- induced dipole attraction. It majorly works for noble gases like argon, and neon. In the case of halogens, as we move down the size of the atoms increases and the van der Waal forces become more prominent hence the London dispersion forces also increase. Therefore, iodine has the strongest dispersion force and chlorine has the weakest.
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Q: arrange the molecules by the strength of the london (dispersion) force interactions between molecules.
chlorine gas, bromine gas, iodine gas
For the following acid-base reaction, predict the position of the equilibrium and identify the most acidic compound.O favor the right side with compound I being the most acidic compound O favor the right side with compound III being the most acidic compound O favor the left side with compound I being the most acidic compound O favor the left side with compound III being the most acidic compound O the reaction is at equilibrium so all the compounds are in equal concentration
Favour the right side with compound I being the most acidic compound.Option (b) is correct
Because carbonyl is electron withdrawing group.out of halogen fluorine is most electronegative so it's show it's negative inductive effect and inductive effect is maximum upto 3 atom.in option( b) it is near to carbonyl . Electron withdrawing group increase acidic strength and halogen are electron withdrawing group,out of all halogen Fluorine is most electron withdrawing atom .The substance is acidic if there are more positively charged hydroniums than negatively charged hydroxyls. If there are more positively charged hydroniums than negatively charged hydroxyls, the compound becomes basic.. The term "potential (or power) of hydrogen" actually denotes pH.
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A chemist adds 265.0 mL of a 0.122 M barium chlorate (Ba(CIO3)2) solution to a reaction flask. Calculate the mass in grams of barium chlorate the chemist has added to the flask.
The chemist added 0.1424 g of barium chlorate to the flask.
To calculate the mass of barium chlorate added to the reaction flask, we need to use the formula: mass = molarity x volume x molar mass.
First, we need to find the molar mass of barium chlorate. The molar mass is calculated by adding the molar masses of all the atoms in the compound.
The formula for barium chlorate is Ba(CIO₃)₂, which means it is made up of one barium atom (Ba), two chlorine atoms (Cl), six oxygen atoms (O), and two iodine atoms (I).
The molar mass of barium is 137.327 g/mol, chlorine is 35.453 g/mol, oxygen is 15.999 g/mol, and iodine is 126.904 g/mol.
So the molar mass of barium chlorate is (137.327 + 235.453 + 615.999 + 2×126.904) g/mol = 479.205 g/mol.
Next, we need to use the formula mass = molarity x volume x molar mass. We know that the molarity is 0.122 M, the volume is 265.0 mL and the molar mass is 479.205 g/mol. So we can plug these values into the formula: mass = 0.122 x 0.265 x 479.205.
After converting the volume to L and using the formula, we get 0.1220.265479.205 = 0.1424 g.
So the chemist added 0.1424 g of barium chlorate to the flask.
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the value for h of the following reaction is -126 kj/mol. you are tasked with making 2.00 moles of naoh. how much heat is transferred into or out of the system in the process? select the answer with the sign that properly indicates the direction of heat flow.
The value for h of the following reaction is -126 kJ/mol. you are tasked with making 2.00 moles of NaOH. 63 kJ heat is released out of the system in the process.
Exothermic chemical reactions are those that release energy. When bonds are broken in the reactants during exothermic reactions, more energy is released when bonds are formed in the products. The reaction mixture's temperature rises as a result of exothermic reactions.
Now, consider the given equation:
2 Na₂O₂ (s) + 2 H₂O (l) → 4NaOH (s) + O₂ (g)
Given, ΔH = -126 kJ
As we know,
4 moles of NaOH - (-126) kJ
2 moles of NaOH - X
it means,
4 × X = (-126) × 2
⇒ 4X = -252
⇒X = -63kJ
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The complete question is:
The value for h of the following reaction is -126 kJ/mol. you are tasked with making 2.00 moles of NaOH. how much heat is transferred into or out of the system in the process? select the answer with the sign that properly indicates the direction of heat flow.
2 Na₂O₂ (s) + 2 H₂O (l) → 4NaOH (s) + O₂ (g)
A) 252
B) 63
C) 3.9
D) 7.8
the two gas samples represented in the graph above are at the same temperature. which of the following statements about the gases is correct?
C is correct. Gas Z has a smaller molar mass than gas X because of the concept of kinetic energy.
As shown in the diagram, there are two gases Z and X. It is provided in the data that the temperature of the gases are the same, which indirectly says that the kinetic energy of both gases is same. Kinetic energy is the term that defined energy stored in the particles due to their motion or velocity. Its SI unit is Joule. And its formula is [tex]\frac{1}{2}[/tex]m[tex]v^{2}[/tex] . So kinetic energy of Z= Kinetic energy of X.
Therefore, the gas with a higher molecular speed will have a lower molecular mass. And it can be seen from the graph that Z has more speed, so it will have a smaller molar mass.
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Q: the two gas samples represented in the graph above are at the same temperature. which of the following statements about the gases is correct?
A. Z has more kinetic energy than X
B.Fewer molecule in present in Z
C. Z has smaller molar mass
D. Z has larger molar mass
