Week 3 Practice Problems

Week 3 Practice Problems - CHEMISTRY 201X Practice Problems...

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CHEMISTRY 201X September 4-7, 2007 Practice Problems (22) (a) Calculate the density (g/mL) of sulfur hexafluoride gas at 720 torr and 35.0°C. (b) Calculate the molar mass (g/mol) of a vapor that has a density of 7.135 g/L at 12°C and 743 torr. (23) Calcium hydride, CaH 2 , reacts with water to form hydrogen gas and calcium hydroxide. (a) Write the balanced chemical equation for this reaction. (b) How many grams of calcium hydride are necessary to generate 60.0 L of hydrogen gas if the pressure of hydrogen is 740.0 torr at 20°C? (24) A self-contained breathing apparatus used by firefighters and rescue workers rely on the reaction between potassium superoxide, KO 2 (s), and water vapor (in the breath) to generate oxygen gas. (a) Write the balanced chemical equation for this process. Potassium hydroxide is another by-product of the reaction. (b) How many grams of potassium superoxide are necessary to produce 20.0 L oxygen gas at normal conditions? (c)
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Week 3 Practice Problems - CHEMISTRY 201X Practice Problems...

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