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## Homework Statement

The average kinetic energy of a 2.35g sample of argon gas in a 7.00L container is 2.58E-22 j/atom.

## Homework Equations

a) What is the pressure of the gas?

b) What is the rot mean square velocity of teh argon atoms under these conditions?

## The Attempt at a Solution

I tried several different formulas none of which helped at all. For all of them it seems I still have on variable for which i cannot solve. For isntance in the KE=.5mv^2 equation for b) my answer does not match the answer in the book when I isolate v and take the root. For part a) the question does not give the temperature so I tried rearranging several equations to no avail. Any help is appreciated, thank you.