Determine the Mole Fraction of CO₂ in a Gas Mixture

Determine the mole fraction of CO₂ in a gas mixture composed of 10.0 grams of CO₂ and 10.0 grams of helium.The mixture is at 75ºC in a 12.0-liter container.

A) 0.92
B) 2.7
C) 0.23
D) 0.080
E) 0.77