Answer:
one mole of water (6.022 x 10 23 molecules) has a mass of 18.02 g. One mol of NaCl (6.02 x1023 formulas) has a mass of 58.44 g.
Explanation:
• The mole (or mol) represents a certain number of objects.
• SI def.: the amount of a substance that contains the same
number of entities as there are atoms in 12 g of carbon-12.
• Exactly 12 g of carbon-12 contains 6.022 x 10 23 atoms.
• One mole of H 2O molecules
contains 6.022 x 10 23 molecules.
• 1 mole contains 6.022 x 10 23 entities (Avogadro’s number)
• One mole of NaCl contains 6.022 x 10 23 NaCl formula units.
• Use the mole quantity to count formulas by weighing them.
• Mass of a mole of particles = mass of 1 particle x 6.022 x 1023
Mass of 1 H atom: 1.008 amu x 1.661 x10-24 g/amu = 1.674 x10-24 g
Mass of 1 mole of H atoms:
1.674 x10-24g/H atom x 6.022 x1023H atoms = 1.008 g
• The mass of an atom in amu is numerically the same
as the mass of one mole of atoms of the element in grams.
• One atom of sulfur has a mass of 32.07 amu;
one mole of S atoms has a mass of 32.07 g
a sample of glucose contains 1.250x10^21 carbon atoms, how many atoms of hydrogen does it contain?
Answer:
Hydrogen = 2.5 * 10^21
Explanation:
Chemical Formula Glucose: C₆H₁₂O₆
One of the ways you could do this is to notice that for every carbon atom there are two Hydrogen atoms. You can state this more formally by using the formula to set up a ratio: 12/6 = hydrogen to Carbon
So if there are 1.250 * 10^21 Carbon atoms in the Glucose sample, then there will be twice as many hydrogen atoms.
H = 2 * 1.25 * 10^21 = 2.5 * 10^21 atoms
You could do this more formally by setting up a proportion.
6 Carbon / 12 Hydrogen = 1.25*10^21 / x Cross Multiply
6*x = 12 * 1.25*10^21 Combine the right
6x = 1.5 * 10^22 Divide by 6
x = 2.5 * 10^21
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What is the empirical formula for C2H4S2?
Answer:
46
Explanation: ihjk
PLEASE I WILL GIVE BRAINLISET PLS HELPPPP
Answer:
the answer is A because the rest wouldnt go good with the work
Explanation:
Which of the following is an example of a scientific model?
The total inches of rainfall during a thunderstorm
A telescope used to study the stars
A computer program that simulates atmospheric conditions
A song about the Grand Canyon
How many decigrams of chromium are in 3.19 x 10^23 atoms of chromium? show work
mol = 3.19 × 10^23/6.02^23
= 0.529 mol
mass = 0.529 × 52
= 27.508 g
g to decigram
= 27.508 × 10
= 275.08 decigram
The specific heat of water is 4.184 J/gºC. How much energy (in
joules) is required to raise the temperature of 18g of H2O from
283K to 293K?
Is it correct ?!???!);$);
Answer:
None of the above
Explanation:
process of elimination i guess, also delta E measures the amount of change in visual perception of two colors, so it probably wont mean w (work).
then again i may be wrong-
What is the stock name for chromic ion
Answer:
Chromium(III)
PubChem CID 27668
Structure Find Similar Structures
Chemical Safety Laboratory Chemical Safety Summary (LCSS) Datasheet
Molecular Formula Cr+3
Synonyms Chromium(III) Chromic ion chromium(3+) CHROMIUM (III) Chromic cation More
What is a scientific law?
Answer:
Scientific laws or laws of science are statements, based on repeated experiments or observations, that describe or predict a range of natural phenomena. The term law has diverse usage in many cases across all fields of natural science.
Explanation:
I hope this helps
Answer:
Scientific laws or laws of science are statements, based on repeated experiments or observations, that describe or predict a range of natural phenomena. Scientific law differs from scientific theory. The main difference between a law and a theory is that a theory tries to explain the reasoning behind something that occurs in nature, whereas scientific laws are just descriptive accounts of how something occurs in nature.
list 2 sources of waste water
Answer:
residential and domestic sources.
Explanation:
The Planet Venus is surrounded by a thick layer of gases. In fact the atmospheric preassure on Venus is over 90 times grater than the atmospheric preassure on Earth. Wcich statements are true about boiling water on Venus? Choose the TWO STATEMENTS that aply.
A. Water will boil at a higher temperature on Venus than on Earth.
B. Water will boil at a lower temperature on Venus than on Earth.
C. The temperature of the water will remain constant as it boils.
D. The temperature will increase as it boils.
what is meaning of coordination bond?
Answer:
Coordinate-bond meaning
A type of covalent bond in which both the shared electrons are contributed by one of the two atoms. ... The definition of a coordinate bond is a chemical bond between two atoms when one of the atoms shares a pair of electrons.
Explanation:
Explanation:
is a covalent bond in the sharing of electron pair equally between two atoms in which each atom contribute an electron.
it is form when atomic orbitals of atoms each containing an unpaired electron overlap to share the pair of electrons.
Hi what is kinematic??
Answer:
Kinematics is a branch of physics concerned with the geometrically possible motion of a body or system of bodies without considering the forces which are involved
Hope it helpsssss.!!!!
describe the atomic models above in terms of
a. location of nucleus
b.location of electrons
I have a problem with solving this type of chemistry problem. Please Help!
A sample of CO2 gas at 100 degrees Celsius has a volume of 250 mL at 760 mm Hg. How many moles of CO2 are present
There are 8.16 × 10-³ moles of CO2 gas at 100°C with a volume of 250 mL at 760 mm Hg.
HOW TO CALCULATE NUMBER OF MOLES:
The number of moles of a sample of gas can be calculated using the following formula:
PV = nRT
Where;
P = pressure of gas (atm)V = volume (L)n = number of moles (mol)R = gas law constant (0.0821 Latm/molK)T = temperature (K)According to this question;
P = 760mmHg = 1 atmT = 100°C = 100 + 273 = 373KV = 250mL = 0.250Ln = ?1 × 0.250 = n × 0.0821 × 373
0.250 = 30.62n
n = 0.250 ÷ 30.62
n = 8.16 × 10-³mol
Therefore, there are 8.16 × 10-³ moles of CO2 gas at 100°C with a volume of 250 mL at 760 mm Hg.
Learn more about number of moles at: https://brainly.com/question/4147359
2CH3CHO+O2=> 2CH3COOH
Answer:
2CH3CHO + O2 → 2CH3COOH
NEED ANSWER! WILL BRAINLIST!
• Why are tailings an environmental concern?
A. They are a form of sewage that is found in agricultural runoff.
B. They are the remains from mining and contain harmful chemicals.
C. They are the waste products left over from fracking for natural gas.
D. They are a type of greenhouse gas that can enter the atmosphere.
B. They are the remains from mining and contain harmful chemicals.
non-protein amino acid (A) orithine (B) homocysteine
Answer:
Homocysteine is though to be a non-protein animo acid. however in vintro studies suggest that Homocysteine is likely to be incorporated by inderict
What's similar about the valence electrons of Carbon and Silicon?
Answer:
Explanation: Carbon and silicon BOTH come from Group 14 of the Periodic Table , i.e. both formally have the same number of valence electrons, 4 such electrons.........
Passive prostheses are:
- self-regulated
- easily corroded
- made of nanotubes
- self-powered
Passive prostheses are self-regulating, as shown in the first answer option.
We can arrive at this answer because:
Passive prostheses are devices used to replace parts of the body that were lost by an incident.These prostheses are very useful to establish balance or the aesthetics of the body, but they have no articulations and no movement mechanism, being static.This limitation allows passive prostheses not to need external regulation and to be self-regulated by fitting the body parts.
You can find more information about articulations and their effects on the link:
https://brainly.com/question/5847359?referrer=searchResults
Answer:
self-powered.
What volume of 0.100 M AgNO3 is
needed to react completely with
45.0 mL of 0.230 M Na2S?
2AgNO3 + Na2S → Ag2S + 2NaNO3
[?] mL AgNO3
Answer:
448mL AgNO3
Explanation:
M x V
n = 0.230 x .045 = 0.01
2AgNO3 + Na2S --> Ag2S+2NaNO3
1 mol Ag2S --> 2 moles AgNO3
.01 mol Ag2S --> ? moles AgNO3
.01x2/1=.02 moles AgNO3
Moles to L conversion is multiplying by 22.4L so we do .02 x 22.4=0.448L
Then we convert to mL so we multiply by 1000 (1000 x 0.448)
448mL AgNO3
There you go friend, good luck with chemistry :)
Consider the energy transfers and transformations that occur when a person rides a bicycle. Describe thi
process by selecting the correct options from the drop-down menus.
Chemical energy is transformed into
energy in the person's muscles.
Kinetic energy is
from the person's legs to the pedals.
Kinetic energy is
thermal energy due to friction when the wheels get warm.
DONE
Answer:
b,a,b
Explanation:
The energy transfers and transformations that occur are kinetic energy is from the person's legs to the pedals and thermal energy due to friction when the wheels get warm.
What is law of conservation of energy?The law of conservation of energy states that energy can neither be created nor destroyed but can be converted from one form to another.
The energy transfers and transformations that occur when a person rides a bicycle are:
Kinetic energy is from the person's legs to the pedals Thermal energy due to friction when the wheels get warmLearn more about conservation of energy here: https://brainly.com/question/24772394
#SPJ6
How many liters of 0.200 M sodium hydroxide do you need to titrate 0.300 L of a 0.100 M diprotic acid to the equivalence point?
The volume of the sodium hydroxide solution needed for the reaction is 0.3 L
We'll begin by writing the balanced equation for the reaction.
H₂X + 2NaOH → 2H₂O + Na₂X
From the balanced equation above, the following data were obtained:
The mole ratio of the acid, H₂X (nA) = 1The mole ratio of base, NaOH (nB) = 2From the question given above, the following data were obtained:
Molarity of base, NaOH (Mb) = 0.2 M. Volume of acid, H₂X (Va) = 0.3 L. Molarity of acid, H₂X (Ma) = 0.1 M. Volume of base, NaOH (Vb) =?MaVa / MbVb = nA / nB
(0.1 × 0.3) / (0.2 × Vb) = 1/2
0.03 / (0.2 × Vb) = 1/2
Cross multiply
0.03 × 2 = 0.2 × Vb
0.06 = 0.2 × Vb
Divide both side by 0.2
Vb = 0.06 / 0.2
Vb = 0.3 LTherefore, the volume of NaOH needed for the reaction is 0.3 L
Learn more on titration: https://brainly.com/question/23298305
A substance has a molar heat of combustion of -810.4 kj/mol. when 0.285 mol of the substance is burned in a calorimeter containing 8.60 kg of water, the increase in water temperature is:
Answer:
6.42 °C
Explanation:
Q = mcΔT
Q = energy gain/release (J)
m = mass (kg)
c = specific heat capacity (J/°C/kg)
ΔT = change in temperature (°C)
Qs = n(ΔH°c)
Qs = energy gained/released from substance (kJ)
n = moles (mol)
ΔH°c = molar heat of combustion (kJ/mol)
m = 8.60
n = 0.285
ΔH°c = -810.4
c (of water) = 4184
Qs = 0.285(-810.4)
Qs = -230.964 (or -230964 J)
Q = 230964
230964 = (8.60)(4184)ΔT
230964 = 35982.4(ΔT)
ΔT = 6.4188... °C → 6.42 °C
The law of conservation of matter states that matter can be neither created nor destroyed. Your friend shows you the following chemical equation: CaCO,CaO+CO, He says that because the oxygen atoms are split between two different molecules in the products, the equation does not support the law of conservation of matter. Is your friend right? Explain your answer.
Answer:
According to conservation of matter, there should be equal amounts of all elements on both the reactant and product side.
Reactant:
1 Ca
1 C
1 O
Product:
1 Ca
1 C
3 O
Therefore, your friend is right because the law of conservation of matter is not followed in this chemical equation.
Explanation:
4 Mg & 3 Cu(NO3)2 + Cu(NO3)2 (aq) + Mg(NO3)2 (aq) + Cu (s)
balance?
Here you go
Mg + 2CuNO3 → Mg(NO3)2 + 2Cu
can y’all please help me answer?
Answer:
It really depends on the situation. If you have 1000 elk and 2 wolves, they really would play a better role in killing off elk so that the elk population doesn't get over populated and diseased, causing a major population collapse. But if there were only 10 elk and 50 wolves, the wolves would play a very negative role on the population.
Hope this helps!
Explanation:
What are the gas laws? (Include Boyle's law, charles's law, gay lussac's law, an avogadro's law) Could someone please summarize these for me ples? Brainliest answer also yes
Answer:
Boyle's Law: When the pressure of a gas increases, the volume of the gas will decrease as long as the temperature and amount of gas are constant.
So basically pressure is inversely proportional to Volume, when one increases, the other decreases, vice versa.
Equation: [tex]P_{1} V_{1} = P_{2} V_{2}[/tex]
Charles Law: When the temperature of a gas increases, the volume of a gas will also increase if the pressure and amount of gas are constant.
So basically Temperature and volume are directly proportional.
Equation: [tex]\frac{V_{1}}{T_{1}} = \frac{V_{2} }{T_{2} }[/tex]
Gay Lussac's Law: When the temperature of a gas increases, the pressure of a gas also increases when volume and the amount of gas remain constant.
Basically, Temperature and Pressure are directly proportional.
Equation: [tex]\frac{P_{1}}{T_{1}} = \frac{P_{2} }{T_{2} }[/tex]
Avogadro's Law: The most intuitive gas law. When you increase the amount of gas, the volume will also increase.
Meaning the moles (amount of gas) is directly proportional to volume.
Equation: [tex]\frac{V_{1} }{n_{1} } = \frac{V_{2} }{n_{2} }[/tex] (n stands for moles)
There is a combined gas law and ideal gas law but those are just the gas laws mentioned above but combined together. These should be everything.
Answer:
Boyle Law is when pressure and volume have a reverse relationship when temperature is the same.Charles law is basically when volume and temperature have a relationship when the pressure is the same.Lussac Law is I think just when I pressure and temperature is directly tied together when the volume stays the same.I dont think there is any "avogadro law", there is only pressure volume and temperature.
Please give brainliest thanks :D
