Question

A mixture of methane and helium is placed in a 2.0 l flask at 27 degrees the partial pressure of methane is 0.72 ATM and the partial pressure of helium is 0.22 ATM . What is the mole fraction of ch4?

Answer 1

mole fractions are proportional to temp:

find total moles:
n=PV/RT where P=.94ATM


n1/n=.72/.94