CHEM 113 CHAPTER 9 AND 10 PRACTICE QUESTIONS AND ANSWERS CORRECT SOLUTION

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A gas sample is held at constant pressure. The gas occupies 3.62 L of volume when the temperature is 21.6°C. Determine the temperature at which the volume of the gas is 3.45 L. a) 309 K b) 281 K c... ) 20.6 K d) 295 K e) 554 K 5. The temperature of a specific amount of gas in a sealed container changes from 20.0°C to 40.0°C. If the volume remains constant, the pressure will change from 755 mmHg to a) 1510 mmHg b) 707 mmHg c) 378 mmHg d) 807 mmHg e) 755 mmHg 6. If 2.10 mol of argon gas occupies a volume of 89.0 L, what volume will 2.45 mol of argon occupy under the same conditions of temperature and pressure? a) 76.3 L b) 103.8 L c) 7.3 mL d) 89.0 L e) 108.8 mL 7. 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. 3.6 L c. 0.15 L d. 4.4 L e. 5.48 L 8. A gas evolved during the fermentation of alcohol had a volume of 19.4 L at 17 °C and 746 mmHg. 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 9. The density of a gas is measured at 1.653 g/L at 746 mmHg and 25.0 °C. What is its molar mass? a. 46.1 g/mol b. 41.2 g/mol c. 0.0542g/mol d. 31.2 g/mol e. 4.55 g/mol 10.How many liters will 20.0 g of Br2 occupy at STP? a. 2.80 L b. 5.4 L c. 1.8 L d. 3.2 L e. None of the above 11. Which gas sample does not occupy a volume of 22.4L? [Show More]

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