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| 1 | |
A mercury manometer is connected on one side to a bulb containing argon, while the other end is open to atmospheric pressure, which is 762 mmHg. The mercury level in the open end of the manometer is 22 mm below that in the side connected to the argon. What is the pressure of argon, in mmHg? |
| | A) | 22 mmHg |
| | B) | 740 mmHg |
| | C) | 762 mmHg |
| | D) | 784 mmHg |
| | E) | none of the above |
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| 2 | |
Convert 380 torr to kilopascals. |
| | A) | 50.7 kPa |
| | B) | 2.64 kPa |
| | C) | 38.5 kPa |
| | D) | 85.4 kPa |
| | E) | 5.07 x 104 kPa |
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| 3 | |
A small bubble rises from the bottom of a swimming pool, where the temperature and pressure are 19°C and 2.50 atm, to the water's surface, where the temperature is 25°C and pressure is 0.88 atm. Calculate the final volume of the bubble if its initial volume was 3.6 mL. |
| | A) | 13.5 mL |
| | B) | 8 mL |
| | C) | 10.4 mL |
| | D) | 1.2 mL |
| | E) | 4.8 mL |
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| 4 | |
Charles' law states that the __________ of a fixed amount of gas is _________ proportional to its ___________. |
| | A) | pressure, inversely, volume |
| | B) | pressure, directly, volume |
| | C) | volume, inversely, temperature |
| | D) | volume, directly, temperature |
| | E) | pressure, directly, temperature |
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| 5 | |
A sample of a gas occupies 2.78 x 103 mL at 25°C and 760 mmHg. What volume will it occupy at the same temperature and 475 mmHg? |
| | A) | 1.74 L |
| | B) | 4.45 L |
| | C) | 1.04 L |
| | D) | 3.67 L |
| | E) | none of the above |
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| 6 | |
Most explosives are compounds that can produce a large quantity of gas in a confined space in a short period of time. Suppose that a cannon is charged with sufficient gunpowder to produce 12.5 moles of gas inside a 521 mL chamber. If the temperature in the chamber is 103°C after the charge is ignited, what is the pressure, in atmospheres, behind the cannonball when the gunpowder goes off? |
| | A) | 0.203 atm |
| | B) | 0.740 atm |
| | C) | 201 atm |
| | D) | 203 atm |
| | E) | 740 atm |
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| 7 | |
A helium balloon lifts off at 1.0 atm and 25°C with a volume of 1.5 x 103 L. At an altitude of 21 km the temperature is -50°C and the atmospheric pressure is 76.0 mm Hg. What is the volume of this balloon at 21 km? |
| | A) | 8.9 x 10-5 L |
| | B) | 1.9 x 102 L |
| | C) | 1.5 x 103 L |
| | D) | 7.5 x 103 L |
| | E) | 1.2 x 104 L |
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| 8 | |
The density of a gas at 1 atm and 0°C is 1.43 g/L. What is the gas? |
| | A) | H2 |
| | B) | He |
| | C) | CH4 |
| | D) | O2 |
| | E) | SO2 |
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| 9 | |
A sample of a gaseous compound of nitrogen and oxygen weighs 5.25 g and occupies a volume of 1.00 L at a pressure of 1.26 atm and temperature of -4.0°C. Which of the following molecular formulas could be that of the compound? |
| | A) | NO |
| | B) | NO2 |
| | C) | N3O6 |
| | D) | N2O4 |
| | E) | N2O5 |
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| 10 | |
A mixture of three gases has a pressure of 1380 mmHg at at 298 K. The mixture is analyzed and is found to contain 1.27 mol CO2, 3.04 mol CO, and 1.50 mol Ar. What is the partial pressure of Ar? |
| | A) | 238 mm Hg |
| | B) | 302 mm Hg |
| | C) | 356 mm Hg |
| | D) | 1753 mm Hg |
| | E) | 8018 mm Hg |
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| 11 | |
Chlorine gas can be prepared in the laboratory by the reaction of manganese dioxide with hydrochloric acid. How much MnO2 should be reacted with excess HCl to obtain 275 mL of chlorine gas at 5.0°C and 650 mmHg?
Equation: MnO2(s) + 4HCl(aq) → MnCl2(aq) + 2H2O(l) + Cl2(g) |
| | A) | 0.0103 g |
| | B) | 0.837 g |
| | C) | 0.896 g |
| | D) | 249 g |
| | E) | 681 g |
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| 12 | |
If the volume and temperature of a sample of gas are increased at constant pressure, the average velocity _______, the average force of an individual collision _________, and the average number of collisions with the wall per second_______. |
| | A) | increases, increases, increases |
| | B) | increases, increases, decreases |
| | C) | increases, decreases, increases |
| | D) | increases, decreases, decreases |
| | E) | none of the above |
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| 13 | |
At the same temperature, the rate of effusion of neon atoms will be approximately _____________ times that of arsine gas molecules, AsH3. |
| | A) | 2.0 |
| | B) | 4.0 |
| | C) | 10.0 |
| | D) | 39.0 |
| | E) | 78.0 |
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| 14 | |
Which of the following gases deviates most from ideal behavior? |
| | A) | nitrogen |
| | B) | oxygen |
| | C) | methane |
| | D) | hydrogen chloride |
| | E) | helium |
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| 15 | |
Given that 4.80 moles of CO2 occupy 6.75 L at 56°C, which of the following is the correct pressure of the gas? [use the van der Waals equation (a = 3.59 atm·L2·mol-2; b = 0.0427 L·mol-1)] |
| | A) | 7.76 atm |
| | B) | 44.2 atm |
| | C) | 6.49 atm |
| | D) | 18.0 atm |
| | E) | 19.8 atm |
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