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Self Assessment A
Question 1
A sample of gas occupies 2.78 x 103 mL at 25oC and 760 mm Hg. What volume
will the gas sample occupy at the same temperature and 475 mm
Hg?
A) 0.130 L
B) 1.04 L
C) 1.74 L
D) 4.45 L
E) None of the above
Question 2
A steel tank contains carbon dioxide at a pressure of 13.0 atm when the
temperature is 34 oC. What will be the internal gas pressure when the tank
and its contents are heated to 100oC.
A) 38.2 atm
B) 9.40 atm
C) 10.7 atm
D) 15.8 atm
E) None of the above
Question 3
Calculate the density of nitrogen gas, in grams per liter, at STP.
A) 0.625 g/L
B) 0.800 g/L
C) 1.25 g/L
D) 2.50 g/L
E) None of the above
Question 4
A gas evolved during the fermentation of alcohol had a volume of 19.4 L at 17
oC and 746 mm Hg. How many moles of gas were collected?
A) 1.25 mol
B) 0.800 mol
C) 10.5 mol
D) 13.6 mol
E) 608 mol
Question 5
How many grams of carbon dioxide are contained in 550 mL of this gas at STP?
A) 0.0245 g
B) 0.0280 g
C) 1080 g
D) 0.560 g
E) 1.1 g
Question 6
A 1.325 g sample of an unknown vapor occupies 368 mL at 114 oC and 946 mm Hg.
The empirical formula of the compound is NO2. What is the
molecular formula of the compound?
A) NO2
B) N4O8
C) N3O6
D) N2O4
E) N5O10
Question 7
An organic compound was analyzed and found to contain 55.8% C, 7.03% H, and
37.2% O. A 1.500 g sample of the compound was vaporized and
found to occupy 530 cm3 at 100oC and 740 torr. Which of the following is the
correct molecular formula of the compound?
A) C2H3O
B) C6H4O2
C) C3H2O
D) C4H6O2
E) C2H3O2
Question 8
What volume of chlorine gas at 646 torr and 32oC would be produced by the
reaction of 14.75 g of MnO2 according to the following chemical
equation?
MnO2(s) + 4 HCl(aq) ----> MnCl2(aq) + Cl2(g) + 2 H2O(l)
A) 5.00 L
B) 0.170 L
C) 2.33 L
D) 0.200 L
E) None of the above
Question 9
A mixture of neon, argon, and xenon had a total pressure of 1560 mm Hg at 298
K. The mixture was found to contain 1.50 mol Ne, 2.65 mol Ar, and
1.75 mol Xe. What is the partial pressure of Xe?
A) 701 mm Hg
B) 658 mm Hg
C) 396 mm Hg
D) 463 mm Hg
E) None of the above
Question 10
Deviations from the ideal gas law are smaller at:
A) low temperatures and high pressures
B) low temperatures and low pressures
C) high temperatures and high pressures
D) high temperatures and low pressures
Question 11
Which of the following correctly identifies Boyle's law?
A) PV=k1
B) V=k2T
Question 12
The magnitude of one Kelvin, one Celsius degree, and one degree on the
absolute temperature scale is the same.
A) True
B) False
Question 13
The Kelvin temperature scale is useful when comparing:
A) various gas samples at different densities
B) volume of a gas sample with temperature at constant pressure
C) pressure of gas samples at different volumes and constant temperature
D) various liquids at constant pressure
Question 14
Which of the following is not an assumption of the kinetic theory of gases?
A) Elasticity refers to the molecules random interactions resulting in no net
energy change.
B) Gas molecules are viewed as points due to large distances between them.
C) Gas molecules can attract other gas molecules.
D) Temperature in Kelvin and average kinetic energy are proportional.
Question 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 compressible.
Question 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
Question 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
Question 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) 3.7 L
C) 0.15 L
D) 4.4 L
E) 5.48 L
Question 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
Question 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
Question 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
Question 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 L
C) 28 L
D) 18.9 L
E) 30.6 L
Question 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
Question 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 L 2.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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