Chemistry Chapter 10B (Prentice)
 
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Chemistry Chapter 10B (Prentice)

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 
What is true about the molar mass of chlorine gas?
a.
The molar mass is 35.5 g.
b.
The molar mass is 71.0 g.
c.
The molar mass is equal to the mass of one mole of chlorine atoms.
d.
none of the above
 

 2. 
What is the number of moles of beryllium atoms in 36 g of Be?
a.
0.25 mol
c.
45.0 mol
b.
4.0 mol
d.
320 mol
 

 3. 
How many moles of CaBrmc003-1.jpg are in 5.0 grams of CaBrmc003-2.jpg?
a.
2.5 mc003-3.jpg 10mc003-4.jpg mol
c.
4.0 mc003-7.jpg 10mc003-8.jpg mol
b.
4.2 mc003-5.jpg 10mc003-6.jpg mol
d.
1.0 mc003-9.jpg 10mc003-10.jpg mol
 

 4. 
What is the mass of silver in 3.4 g AgNOmc004-1.jpg?
a.
0.025 g
c.
2.2 g
b.
0.64 g
d.
3.0 g
 

 5. 
What is the mass of oxygen in 250 g of sulfuric acid, Hmc005-1.jpgSOmc005-2.jpg?
a.
0.65 g
c.
16 g
b.
3.9 g
d.
160 g
 

 6. 
The volume of one mole of a substance is 22.4 L at STP for all ____.
a.
gases
c.
solids
b.
liquids
d.
compounds
 

 7. 
The molar volume of a gas at STP occupies ____.
a.
22.4 L
c.
1 kilopascal
b.
0mc007-1.jpgC
d.
12 grams
 

 8. 
Which combination of temperature and pressure correctly describes standard temperature and pressure, STP?
a.
0mc008-1.jpgC and 101 kPa
c.
0mc008-3.jpgC and 22.4 kPa
b.
1mc008-2.jpgC and 0 kPa
d.
100mc008-4.jpgC and 100 kPa
 

 9. 
The molar mass of a gas can be determined from which of the following?
a.
the density of the gas at STP
c.
Avogadro's number
b.
the volume of a mole of the gas
d.
none of the above
 

 10. 
What is the volume, in liters, of 0.500 mol of Cmc010-1.jpgHmc010-2.jpg gas at STP?
a.
0.0335 L
c.
16.8 L
b.
11.2 L
d.
22.4 L
 

 11. 
What is the number of moles in 500 L of He gas at STP?
a.
0.05 mol
c.
22 mol
b.
0.2 mol
d.
90 mol
 

 12. 
What is the number of moles in 9.63 L of Hmc012-1.jpgS gas at STP?
a.
0.104 mol
c.
3.54 mol
b.
0.430 mol
d.
14.7 mol
 

 13. 
What is the density at STP of the gas sulfur hexafluoride, SFmc013-1.jpg?
a.
0.153 g/L
c.
3270 g/L
b.
6.52 g/L
d.
3.93 mc013-2.jpg 10mc013-3.jpg g/L
 

 14. 
The molar mass of a certain gas is 49 g. What is the density of the gas in g/L at STP?
a.
3.6 mc014-1.jpg 10mc014-2.jpg g/L
c.
2.2 g/L
b.
0.46 g/L
d.
71 g/L
 

 15. 
A 22.4-L sample of which of the following substances, at STP, would contain 6.02 mc015-1.jpg 10mc015-2.jpg representative particles?
a.
oxygen
c.
cesium iodide
b.
gold
d.
sulfur
 

 16. 
If the density of an unknown gas Z is 4.50 g/L at STP, what is the molar mass of gas Z?
a.
0.201 g/mol
c.
26.9 g/mol
b.
5.00 g/mol
d.
101 g/mol
 

 17. 
Which of the following gas samples would have the largest number of representative particles at STP?
a.
12.0 L He
c.
0.10 L Xe
b.
7.0 L Omc017-1.jpg
d.
0.007 L SOmc017-2.jpg
 

 18. 
Given 1.00 mole of each of the following gases at STP, which gas would have the greatest volume?
a.
He
c.
SOmc018-2.jpg
b.
Omc018-1.jpg
d.
All would have the same volume.
 

 19. 
If the density of a noble gas is 1.783 g/L at STP, that gas is ____.
a.
Kr
c.
Ar
b.
Xe
d.
He
 

 20. 
If 60.2 grams of Hg combines completely with 24.0 grams of Br to form a compound, what is the percent composition of Hg in the compound?
a.
28.5%
c.
71.5%
b.
39.9%
d.
60.1%
 

 21. 
What is the percent composition of chromium in BaCrOmc021-1.jpg?
a.
4.87%
c.
20.5%
b.
9.47%
d.
25.2%
 

 22. 
If 20.0 grams of Ca combines completely with 16.0 grams of S to form a compound, what is the percent composition of Ca in the compound?
a.
1.25%
c.
44.4%
b.
20.0%
d.
55.6%
 

 23. 
What is the percent composition of carbon, in heptane, Cmc023-1.jpgHmc023-2.jpg?
a.
12%
c.
68%
b.
19%
d.
84%
 

 24. 
What is the percent by mass of carbon in acetone, Cmc024-1.jpgHmc024-2.jpgO?
a.
20.7%
c.
1.61%
b.
62.1%
d.
30.0%
 

 25. 
Which expression represents the percent by mass of nitrogen in NH4NO3?
a.
14 g N/80 g NHmc025-1.jpgNOmc025-2.jpg mc025-3.jpg 100%
c.
80 g NHmc025-7.jpgNOmc025-8.jpg/14 g N mc025-9.jpg 100%
b.
28 g N/80 g NHmc025-4.jpgNOmc025-5.jpg mc025-6.jpg 100%
d.
80 g NHmc025-10.jpgNOmc025-11.jpg/28 g N mc025-12.jpg 100%
 

 26. 
Which of the following compounds has the lowest percent gold content by weight?
a.
AuOH
c.
AuClmc026-2.jpg
b.
Au(OH)mc026-1.jpg
d.
AuImc026-3.jpg
 

 27. 
Which of the following compounds has the highest oxygen content, by weight?
a.
Namc027-1.jpgO
c.
BaO
b.
COmc027-2.jpg
d.
Hmc027-3.jpgO
 

 28. 
The lowest whole-number ratio of the elements in a compound is called the ____.
a.
empirical formula
c.
binary formula
b.
molecular formula
d.
representative formula
 

 29. 
Which of the following is NOT an empirical formula?
a.
Cmc029-1.jpgNmc029-2.jpgHmc029-3.jpg
c.
BeCrmc029-6.jpgOmc029-7.jpg
b.
Cmc029-4.jpgHmc029-5.jpgO
d.
Sbmc029-8.jpgSmc029-9.jpg
 

 30. 
Which of the following compounds have the same empirical formula?
a.
COmc030-1.jpg and SOmc030-2.jpg
c.
Cmc030-7.jpgHmc030-8.jpg and Cmc030-9.jpgHmc030-10.jpg
b.
Cmc030-3.jpgHmc030-4.jpg and Cmc030-5.jpgHmc030-6.jpg
d.
Cmc030-11.jpgHmc030-12.jpg and Cmc030-13.jpgHmc030-14.jpg
 

 31. 
What is the empirical formula of a compound that is 40% sulfur and 60% oxygen by weight?
a.
SO
c.
SOmc031-2.jpg
b.
SOmc031-1.jpg
d.
Smc031-3.jpgOmc031-4.jpg
 

 32. 
What is the empirical formula of a substance that is 53.5% C, 15.5% H, and 31.1% N by weight?
a.
Cmc032-1.jpgHNmc032-2.jpg
c.
Cmc032-6.jpgHmc032-7.jpgN
b.
Cmc032-3.jpgHmc032-4.jpgNmc032-5.jpg
d.
CHmc032-8.jpgNmc032-9.jpg
 

 33. 
The ratio of carbon atoms to hydrogen atoms to oxygen atoms in a molecule of dicyclohexyl maleate is 4 to 6 to 1. What is its molecular formula if its molar mass is 280 g?
a.
Cmc033-1.jpgHmc033-2.jpgOmc033-3.jpg
c.
Cmc033-7.jpgHmc033-8.jpgOmc033-9.jpg
b.
Cmc033-4.jpgHmc033-5.jpgOmc033-6.jpg
d.
Cmc033-10.jpgHmc033-11.jpgOmc033-12.jpg
 

 34. 
Which of the following is NOT true about empirical and molecular formulas?
a.
The molecular formula of a compound can be the same as its empirical formula.
b.
The molecular formula of a compound can be some whole-number multiple of its empirical formula.
c.
Several compounds can have the same empirical formula, but have different molecular formulas.
d.
The empirical formula of a compound can be triple its molecular formula.
 

 35. 
Which of the following sets of empirical formula, molar mass, and molecular formula is correct?
a.
CH, 78 g, Cmc035-1.jpgHmc035-2.jpg
c.
CaO, 56 g, Camc035-7.jpgOmc035-8.jpg
b.
CHmc035-3.jpgN, 90 g, Cmc035-4.jpgHmc035-5.jpgNmc035-6.jpg
d.
Cmc035-9.jpgHmc035-10.jpgO, 120 g, Cmc035-11.jpgHmc035-12.jpgOmc035-13.jpg
 



 
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