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## Homework Statement

At 329 K and 1.37 x 10-2 atm, the density of a gas is 1.39 x 10-5 g/cm3. (a) Find vrms for the gas molecules. (b) Find the molar mass of the gas.

## Homework Equations

PV = nRT

Vrms = sqrt(3RT/M)

## The Attempt at a Solution

I could do this problem right now if there was a molar mass given in the question. How does the density help with finding the answer to the problem? I don't see any examples utilizing it so I'm not sure what to do.