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Law of effusion and molar mass

Please explain the below problems, thanks:

A polymer chemist dissolves 6.053g of poly(vinyl alcohol) in enough water to make 100.0mL of solution. At 25 C, the osmotic pressure of this solution [w/respect to pure water] is 0.272atm.
What's the molar mass of the polymer sample?

ans: 5.44x10^3


A bike tire filled with Ar gas deflates in exactly an hour.
When a different gas is used to inflate the tire, it deflates in 217 minutes. What's the closest value to the molecular weight of the (hypothetical) second gas (g/mol)?

Ans: 523

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Solution Summary

This solution is provided in 119 words in both .doc and .pdf format. References are provided to further understanding of the topics. Calculations for moles are uses to calculate molar mass and Graham's law is uses to find molecular weight.