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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. Molecular compounds of low molecular weight tend to be gases at room temperature. Which of the following is most likely not a gas at room temperature?
2. A gas at a pressure of 325 torr exerts a force of __________ N on an area of 5.5 m2 .
3. Which of the following is not part of the kinetic-molecular theory?
4. A gas originally at 27 °C and 1.00 atm pressure in a 3.9 L flask is cooled at constant pressure until the temperature is 11 °C. The new volume of the gas is __________ L.
5. Since air is a mixture, it does not have a 'molar mass.' However, for calculation purposes, it is possible tospeak of its 'effective molar mass.' (An effective molar mass is a weighted average of the molar masses of a mixture's components.) If air at STP has a density of 1.285 g/L, its effective molar mass is __________ g/mol.
6. Which statement about ideal behavior of gases is false?
7. The reaction of 50 mL of Cl2 gas with 50 mL of CH4 gas via the equation:
Cl2 (g) + CH4 (g) . HCl (g) + CH3Cl (g) will produce a total of __________ mL of products if pressure and temperature are kept constant.
8. Zinc reacts with aqueous sulfuric acid to form hydrogen gas:
Zn (s) + H2SO4 (aq) . ZnSO4 (aq) + H2 (g)
In an experiment, 201 mL of wet H2 is collected over water at 27 °C and a barometric pressure of 733 torr. The vapor pressure of water at 27 °C is 26.74 torr. The partial pressure of hydrogen in this experiment is__________ atm.
9. The molar volume of a gas at STP is __________ L.
10. The van der Waals equation for real gases recognizes that __________.
11. 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?
12. According to kinetic-molecular theory, if the temperature of a gas is raised from 100 °C to 200 °C, the average kinetic energy of the gas will __________.
13. The density of N2O at 1.53 atm and 45.2 °C is __________ g/L.
14. A gas vessel is attached to an open-end manometer filled with a nonvolatile liquid of density 0.993 g/mL asshown below. The difference in heights of the liquid in the two sides of the manometer is 32.3 cm when the atmospheric pressure is 765 mmHg. Given that the density of mercury is 13.6 g/mL, the pressure of the enclosed gas is __________ atm.
15. A sample of He gas (2.0 mmol) effused through a pinhole in 53 s. The same amount of an unknown gas, underthe same conditions, effused through the pinhole in 248 s. The molecular mass of the unknown gas is __________ g/mol.
16. At STP, the ratio of the root-mean-square speed of CO2 to that of SO2 is __________.
17. The pressure exerted by a column of liquid is equal to the product of the height of the column times the gravitational constant times the density of the liquid, P = ghd. How high a column of water (d = 1.0g/mL) would besupported by a pressure that supports a 713 mm column of mercury (d = 13.6g/mL)?
18. 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.
19. If 50.75 g of a gas occupies 10.0 L at STP, 129.3 g of the gas will occupy __________ L at STP.
20. The density of __________ is 0.900 g/L at STP.
21. According to kinetic-molecular theory, in which of the following gases will the root-mean-square speed of the molecules be the highest at 200 °C?
22. The volume occupied by 1.5 mol of gas at 35 °C and 2.0 atm pressure is __________ L.
23. The pressure of a sample of CH4 gas (6.022 g) in a 30.0 L vessel at 402 K is __________ atm.
24. A real gas will behave most like an ideal gas under conditions of __________.
25. Ammonium nitrite undergoes thermal decomposition to produce only gases:
NH4NO2 (s) . N2 (g) + 2H2O (g) What volume (L) of gas is produced by the decomposition of 35.0 g of NH4NO2 (s) at 525 ° C and 1.5 atm?

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