gas help.

[newbiee]

In a mixture if methane(CH4) and oxygen, the partial pressures of the two gases are 0.175atm and 0.250 atms, respectively.

1. what is the mole fraction of each gas in the mixture?

2, If the micture occupies a volume of 2.00k at 65cm caculate the total number of moles of gas in the mixture.



thanks.