Calculating Partial pressure (in torr)?

Use mole fraction instead. Total moles = 6; total pressure = 10 atm. mole fraction of N2 is 3/6 = .5, so N2 is responsible for .5 X 10 atm = 5 atm.Mole fraction of O2 is 2/6; mole fraction of CO2 is 1/6.. Etc - crank it out All the partial pressures will add up to 10