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## Homework Statement

At a certain temperature a sample of oxygen has a pressure of 2.0 x 10^6 Pa, and a density of 4.0 x 10^-3 g cm^-3. Find the average speed of the oxygen molecules of the gas.

## Homework Equations

Ek= 3/2kT

Ek= 1/2mv^2

## The Attempt at a Solution

I know that the mass of oxygen is 32 g per mole so with this i could find the mass of an individual molecule= 32 g/ 6.02 x 10^23 g

=5.3 x 10^-26 kg

I know P= 2.0 x 10^6 Pa

I just dont understand what to do with the density? can somebody please help me, any help would be much aprpeciated:)

Thankyou!