Illinois Central College CHEMISTRY 130 Laboratory Section: Name: SHOW YOUR WORK PRELAB: Exp.8 Molecular Mass of a Condensable Vapor 1. One liter of an unknown gas weighs 1.55 grams at STP. What is the molecular mass of the gas? 2. The pressure in an automobile tire is 42 psi when the tire temperature is 100°C. What will be the pressure in the tire when the tire cools to 22°C? 3. The molecular mass of propane is 44 g/mol. What is the mass of one liter of propane at STP? 4. A liter of gas at a temperature of 25°C and a pressure of 730 mm weighs 1.6 grams. a. What volume will the gas occupy at STP? b. What is the molecular mass of the gas? 5. What would be the volume of 10.0 grams of oxygen gas at STP? 6. At STP a 5.0 mL sample of gas weighs 0.024 g. What is the molecular mass of the gas?

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