Adapted by Nelson Nuñez-Rodriguez
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By David W. Ball
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| QUESTION | ANSWER |
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1. What is the pressure in pascals if a force of 4.88 kN is pressed against an area of 235 cm2? |
1. 208,000 Pa |
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3. What is the final temperature of a gas whose initial conditions are 667 mL, 822 torr, and 67°C and whose final volume and pressure are 1.334 L and 2.98 atm, respectively? Assume the amount remains constant. |
3. 1,874 K |
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5. Propose a combined gas law that relates volume, pressure, and amount at constant temperature. |
5.
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7. A sample of 6.022 × 1023 particles of gas has a volume of 22.4 L at 0°C and a pressure of 1.000 atm. Although it may seem silly to contemplate, what volume would 1 particle of gas occupy? |
7. 3.72 × 10−23 L |
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9. Use two values of R to determine the ratio between an atmosphere and a torr. Does the number make sense? |
9. 1 atm = 760 torr |
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11. At an altitude of 40 km above the earth’s surface, the atmospheric pressure is 5.00 torr, and the surrounding temperature is −20°C. If a weather balloon is filled with 1.000 mol of He at 760 torr and 22°C, what is its
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11.
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13. Air, a mixture of mostly N2 and O2, can be approximated as having a molar mass of 28.8 g/mol. What is the density of air at 1.00 atm and 22°C? (This is approximately sea level.) |
13. 1.19 g/L |
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15. On the surface of Venus, the atmospheric pressure is 91.8 atm, and the temperature is 460°C. What is the density of CO2 under these conditions? (The Venusian atmosphere is composed largely of CO2.) |
15. 67.2 g/L |
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17. HNO3 reacts with iron metal according to Fe(s) + 2HNO3(aq) → Fe(NO3)2(aq) + H2(g) In a reaction vessel, 23.8 g of Fe are reacted but only 446 mL of H2 are collected over water at 25°C and a pressure of 733 torr. What is the percent yield of the reaction? |
17. 3.99% |