CHEM 1211 Module Six Exam Name: _______________________

Module Six Part H-1 Gas Density Problem 5 points

If the density of Freon is 5.40 g/L at STP, what is the molar mass of Freon?

Module Six Part H-2 Molecular Mass Determination Problem

A sample of an unknown gas weights 2.85 g and occupies 750 mL at 100 ^oC and 760 torre. What is the molar mass of the unknown gas.

Module Six Part I Effusion of Gasses Problem 5 points

A sample of uranium fluoride is found to effuse at the rate of 17.7 mg/hr. Under comparable conditions, gaseous I₂, effuses at the rate of 15.0 mg/hr. What is the molar mass of the uranium fluoride? (Hint: rates must be used in units of moles per time.)