Calculate the mass of CO2 in a mixture

[skaboy607]

Homework Statement

I need to calculate the mass of CO2 in a mixture where there is 1.5kg of N2 and 1kg of O2 present. The total pressure of the mixture is 1.5bar, the volume is 2m^3 and the temperature is 293K. I also know the cv values for the constituents.

Homework Equations

I know lots of equation but they none of them are for just one unknown.

The Attempt at a Solution

I have tried finding the volumetric analysis of the mixture but it all depends on knowing that one mass which I can't find?

Thanks

 

[Mapes]

How many moles of nitrogen and oxygen are present? How many moles of ideal gases need to be present in that volume to produce the given pressure?

 

[skaboy607]

Thanks, I sorted it in the end using the equation Pv=nRT, rearranged to find n and then knowing that sum of n=n02+nN2+nCO2. Rearranged to find nCO2 and then converted back to mass. Pretty sure that's what you suggested anyway.
Thanks