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Chemistry, 7/e
Raymond Chang, Williams College
Gases

Self Assessment B



1

Which of the following is not a characteristic of substances in the gas phase?
A)Substances in the gas phase have much lower densities than the same substances would have in the liquid or solid phase.
B)A mixture of substances in the gas phase will form a homogeneous solution, whereas the same mixture might not form a homogeneous solution in the liquid phase.
C)Substances in the gas phase retain their shapes easily.
D)Substances in the gas phase are easily compressible.
2

The pressure of a gas was determined to be 485 cm Hg. What is the equivalent pressure in atmospheres?
A)0.64 atm
B)33.0 atm
C)6.38 atm
D)1.57 atm
E)6.46 atm
3

A sample of gas occupies 3.00 L at 760 torr. Calculate the volume the gas will occupy if the pressure is changed to 1.45 atm and the temperature remains constant.
A)2.07 L
B)0.48 L
C)4.35 L
D)2280 L
E)1570 L
4

A gas sample has a volume of 4.50 L when the temperature is 28 oC and the pressure is 1.00 atm. What will be the new volume of the gas when the temperature is changed to 0.0 oC and the pressure to 850 torr?
A)0.25 L
B)3.65 L
C)0.15 L
D)4.44 L
E)5.48 L
5

What volume would be occupied by 0.545 mol of a gas at 75 oC and 0.678 atm?
A)60.3 L
B)28.6 L
C)4.95 L
D)33.8 L
E)23.0 L
6

Calculate the density of methane, CH4, at 18 oC and 3.65 atm.
A)39.6 g/L
B)2.45 g/L
C)0.41 g/L
D)0.71 g/L
E)1.85 g/L
7

What is the molar mass of a gas whose density at STP is 3.74 g/L?
A)83.8 g/mol
B)5.99 g/mol
C)41.9 g/mol
D)1.19 x 10-2 g/mol
8

What volume of oxygen can be collected at 20 oC and 730 torr from the complete reaction of 100 g of KClO3, according to the chemical equation shown below? 2 KClO3(s) ----> 2 KCl(s) + 3 O2(g)
A)20.0 L
B)30.6 L
C)28.2 L
D)18.9 L
E)27.5 L
9

Calculate the root-mean-square velocity of CO2 at 0 oC.
A)23.8 m/s
B)393 m/s
C)227 m/s
D)12.4 m/s
E)39.1 m/s
10

Using the van der Waals equation, calculate the pressure exerted by 15.0 mol of carbon dioxide confined to a 3.00-L vessel at 56.0 oC. Note: Values for a and b in the van der Waals equation: a = 3.59 L2.atm/mol, and b = 0.0427 L/mol.
A)23.2 atm
B)2.16 atm
C)81.9 atm
D)96.4 atm








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