Basic Chemistry 基础化学章节测试课后答案2024春

第七章测试

1.A gas at a pressure of 10.0 Pa exerts a force of __________ N on an area of 5.5 m2.
A:55 B:18 C:0.55 D:1.8 E:5.5
答案:A
2.A gas vessel is attached to an open-end manometer containing a non- volatile liquid of density 0.791 g/mL as shown below. The difference in heights of the is 755 mm Hg. Given that the density of mercury is 13.6 g/mL, the pressure of the enclosed gas is __________ atm. liquid in the two sides of the manometer is 43.4 cm when the atmospheric pressure
A:0.96 B:1.03 C:0.99 D:0.987 E:0.993 3.A sample of a gas (5.0 mol) at 1.0 atm is expanded at constant temperature from 10 L to 15 L. The final pressure is __________ atm.
A:1.5 B:15 C:7.5 D:3.3 E:0.67 4.A sample of H2 gas (12.28 g) occupies 100.0 L at 400.0 K and 2.00 atm. A sample weighing 9.49 g occupies__________ L at 353 K and 2.00 atm.
A:77.3 B:147 C:109 D:68.2 E:54.7 5.A 0.325 L flask filled with gas at 0.914 atm and 19 °C contains __________ mol of gas.
A:1.24 × 10-2 B:80.7 C:12.4 D:1.48 × 10-2 E:9.42 6.A sample of gas (1.3 mol) occupies __________ L at 22 °C and 2.5 atm.
A:13 B:3.2 × 10-2 C:0.079 D:0.94 E:31 7.A flask contains a mixture of He and Ne at a total pressure of 2.6 atm. There are 2.0 mol of He and 5.0 mol of Ne in the flask. The partial pressure of He is __________ atm.
A:9.1 B:1.86 C:0.74 D:6.5 E:1.04 8.The root-mean-square speed of CO at 113 °C is __________ m/s.
A:993 B:586 C:31.5 D:317 E:58.3 9.A sample of N2 gas (2.0 mmol) effused through a pinhole in 5.5 s. It will take __________ s for the same amount of CH4 to effuse under the same conditions.
A:4.2 B:9.6 C:3.1 D:7.3 E:5.5 10.Using the van der Waals equation, the pressure in a 22.4 L vessel containing 1.00 mol of neon gas at 100 °C is__________ atm. (a = 0.211 L2 atm/mol2 , b = 0.0171 L/mol)
A:1.21 B:1.37 C:1 D:0.73 E:0.367