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In Class Problems – Section 11.9 Dalton’s Law Calculations - Show all work for full credit.

1 Determine the total pressure of a gas mixture that contains oxygen, nitrogen and helium if the partial pressures of the gases are PO2 = 22.4 KPa, PN2 = 48.9 Kpa, and PHe = 15.8 Kpa.

2 A balloon contains mostly helium and a little methane. The partial pressure of helium is 104.7 KPa. If the pressure inside the balloon is 105.8 Kpa, what is the partial pressure of methane?

For the next three problems, refer to the handout on Water-Vapor Pressures at certain temperatures (Table A-8).3 Determine the partial pressure of oxygen collected by water displacement if the water temperature is 20.0 0

C and the total pressure of the gases in the collection bottle is 730.0 mm Hg.

4 A sample of gas collected over water at a temperature of 35.0 0 C when the barometric pressure reading is 742.0 mm Hg. What is the partial pressure of the dry gas?

5 Some hydrogen gas is collected over water at 20.00 C. The levels of water inside and outside the gas collection bottle are the same. The partial pressure of hydrogen is determined to be 742.5 torr (1 torr = 1mm Hg). What is the barometric pressure at the time the gas is collected?

6 A sample of oxygen is collected in a 175 mL container over water at 15.00 C, and the barometer reads 752.0 torr. What volume would the dry gas occupy at 770.0 torr and 15.00 C?