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Basic Chemistry Practice Test: Gases
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Basic Chemistry Practice Test: Gases
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25 Questions

1. The first person to investigate the relationship between the pressure of a gas and its volume was __________.
2. The molecular weight of a gas that has a density of 5.75 g/L at STP is __________ g/mol.
3. Automobile air bags use the decomposition of sodium azide as their source of gas for rapid inflation:
2NaN3 (s) . 2Na (s) + 3N2 (g). What mass (g) of NaN3 is required to provide 40.0 L of N2 at 25.0 °C and 763 torr?
4. The density of N2O at 1.53 atm and 45.2 °C is __________ g/L.
5. A sample of oxygen gas was found to effuse at a rate equal to two times that of an unknown gas. The molecular weight of the unknown gas is __________ g/mol.
6. The van der Waals equation for real gases recognizes that __________.
7. A pressure of 1.00 atm is the same as a pressure of __________ of mmHg.
8. The amount of gas that occupies 60.82 L at 31 °C and 367 mmHg is __________ mol.
9. Which of the following statements about gases is false?
10. Removal of __________ from the natural gas both purifies the natural gas and serves as an alternative methodof production of an industrially important chemical element.
11. What volume (L) of NH3 gas at STP is produced by the complete reaction of 7.5 g of H2O according to the following reaction? Mg3N2 (s) + 6H2O (l) . 3Mg(OH)2 (aq) + 2NH3 (g)
12. Calcium hydride (CaH2 ) reacts with water to form hydrogen gas:
CaH2 (s) + 2H2O (l) . Ca(OH)2 (aq) + 2H2 (g)
How many grams of CaH2 are needed to generate 48.0 L of H2 gas at a pressure of 0.888 atm and a temperature of 32 °C?
13. A sample of He gas (3.0 L) at 5.6 atm and 25 °C was combined with 4.5 L of Ne gas at 3.6 atm and 25 °C at constant temperature in a 9.0 L flask. The total pressure in the flask was __________ atm. Assume the initial pressure in the flask was 0.00 atm.
14. A gas vessel is attached to an open-end manometer containing a nonvolatile liquid of density 0.791 g/mL asshown below. The difference in heights of the liquid in the two sides of the manometer is 43.4 cm when the atmospheric pressure is 755 mmHg. Given that the density of mercury is 13.6 g/mL, the pressure of the enclosed gas is __________ atm.
15. At a temperature of __________ °C, 0.444 mol of CO gas occupies 11.8 L at 889 torr.
16. A sample of He gas (2.35 mol) occupies 57.9 L at 300.0 K and 1.00 atm. The volume of this sample is__________ L at 423 K and 1.00 atm.
17. Using the van der Waals equation, the pressure in a 22.4 L vessel containing 1.50 mol of chlorine gas at 0.00 °C is __________ atm. (a = 6.49L2 -atm/mol2 , b = 0.0562 L/mol)
18. A sample of gas (1.3 mol) occupies __________ L at 22 °C and 2.5 atm.
19. Which statement about atmospheric pressure is false?
20. The kinetic-molecular theory predicts that pressure rises as the temperature of a gas increases because __________.
21. A 0.325 L flask filled with gas at 0.914 atm and 19 °C contains __________ mol of gas.
22. In ideal gas equation calculations, expressing pressure in Pascals (Pa), necessitates the use of the gas constant, R, equal to __________.
23. A sample of oxygen gas (O2 ) was found to effuse at a rate equal to three times that of an unknown gas. The molecular weight of the unknown gas is __________ g/mol.
24. The density of krypton gas at 1.21 atm and 50.0 °C is __________ g/L.
25. A balloon originally had a volume of 4.39 L at 44 °C and a pressure of 729 torr. The balloon must be cooled to __________°C to reduce its volume to 3.78 L (at constant pressure).

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