Chemistry Hw Help

Question

Calculate the mole fraction of Ar in a mixture of 0.25 mol of He, 2.46 mol of Xe and 5.46mol of Ar.

Answer 1

Mole fraction of a gas is simply the moles of that gas divided by the total moles of all gases present.

Total moles = 0.25 + 2.46 + 5.46 = 8.17 moles

mol fraction Ar = 5.46 / 8.17 = 0.668