[hdawnw]

The partical pressure of methane is 0.175 atm and that of oxeygen is 0.125 in a mixture of two gases.
a) find mole fraction of each gas in the mixture.
b) if the mixture occupies a volume of 10.5L at 65 C, calculate the total number of moles of gas in the mixture.
c) Calculate number of grams of each gas in the mixture.

I've done a and b but I can't figure out how to start c.

[Borek]

You have number of moles, use molar mass.