Name_______________________________________________ Assignment 23 - Gases CP2120 Fall 2020 1. A student wants to build a manometer using a fluid that has a density of 8.597 g/mL. What will the height of

a column of this fluid be at a pressure of 1.00 atm?

2. Determine the number of moles of helium in a 2.25-L balloon at 288 K when the pressure is 1.023 bar.

3. What pressure of nitrogen gas results if a 75.0 L cylinder is filled with 9.909 kg of nitrogen at 18.5 °C?

4. If the total pressure of a gas mixture containing oxygen and nitrogen is 105 Pa, what is the partial pressure of oxygen if the mole fraction of nitrogen gas is 0.700?

5. A 2.000-L sample of dry air at 25.25 °C and 990.9 mm Hg contains 0.8729 g N2 plus some other gases. Determine the partial pressure (in mm Hg) of N2 in the air sample.

6. Hydrogen gas generated during a chemical reaction is collected over water. Determine the mass of hydrogen collected if 200 mL of gas is collected at 23 oC and 800 mm Hg total pressure. At 23 oC, the partial pressure of water is 21.1 mm Hg.

7. Determine the root mean square speed of oxygen molecules in the atmosphere on a warm day (27 °C).

8. A container contains helium and argon gases. Calculate the ratio of effusion rates of helium and argon

through a tiny hole in the container at room temperature (25 oC).

9. Use the ideal gas equation and the van der Waals equation to calculate and compare the pressure exerted by 1.000 mole of carbon dioxide gas in a 10.00-L flask at 0.000 oC.

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