Basic Chemistry 基础化学 第七章_智慧树知到答案2021年

第七章 Gases：Gas properties are described by the kinetic theory historically. Gas concentration in the atmosphere and gases we commonly encounter are described before a detailed investigation of the gas laws. The Kinetic-Molecular theory leads into effusion and diffusion, which finish off the chapter.7.1The Kinetic Theory of Gases:A summary of the kinetic theory of gases starts off this sub-topic and how gas pressure arises. We then find out about gases in the Periodic Table as well as in the atmosphere. Sample exercises help consolidate student learning. The root mean square speed is added for completion.
7.2Ideal and Real Gases:The deviations of real gases from ideal behaviour are focussed on after having stated the gas laws. Observations of how gas pressure varies help explain how the average kinetic of molecules changes.
7.3Combined Gas Laws Relating to Ideal Gases:Combining Boyle's, Charles' and Avogadro's laws yields the ideal gas law. Its units are included and why molar volumes of real gases are not equal. A lot of calculations need to be performed to guarantee students have mastered the gas laws.
7.4Grahams Law of Effusion:Graham's law of effusion is when the rate of effusion of a gas is inversely proportional to its molar mass. The example of the escape of helium and argon from balloons is included and how the law is applied in identifying an unknown gas.
7.5Diffusion and Mean Free Path:Diffusion is the spreading of molecules in space. Its use in uranium enrichment is given as an example. The mean free path then leads into the van der Waals equation and related problems.

[单选题]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)

选项:[0.73, 1, 1.21, 1.37, 0.367]
[单选题]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

选项:[0.987, 0.96, 0.993, 0.99, 1.03]
[单选题]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.

选项:[54.7, 68.2, 147, 77.3, 109]
[单选题]A 0.325 L flask filled with gas at 0.914 atm and 19 °C contains __________ mol of gas.

选项:[9.42, 1.24 × 10-2, 12.4, 1.48 × 10-2, 80.7]
[单选题]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.

选项:[15, 3.3, 0.67, 7.5, 1.5]
[单选题]A sample of gas (1.3 mol) occupies __________ L at 22 °C and 2.5 atm.

选项:[31, 3.2 × 10-2, 0.079, 0.94, 13]
[单选题]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.

选项:[9.1, 1.86, 0.74, 6.5, 1.04]
[单选题]A gas at a pressure of 10.0 Pa exerts a force of __________ N on an area of 5.5 m2.

选项:[0.55, 18, 5.5, 1.8, 55]
[单选题]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.

选项:[4.2, 5.5, 9.6, 3.1, 7.3]
[单选题]The root-mean-square speed of CO at 113 °C is __________ m/s.

选项:[586, 317, 58.3, 31.5, 993]