A gas mixture in a 3.100 L container at 415°C contains 1.30 g each of Ar, CO, and CH4. Find the partial pressure of Ar (in atmospheres).
Find the total pressure of the gas mixture (in atmospheres).
Find the mole fraction of CO.
Do I use PV=nRT for partial pressure and if I do how do I find mole fraction
Yes. Convert each gas to mols = grams/molar mass. Use n = total mols and PV = nRT to solve for total P.
Use n = ? for Ar and redo PV = nRT, solve for P and that will be pAr.
XCO = mols CO/total mols.