An gas mixture containing carbon dioxide (1) and propane (2) is in equilibrium with a liquid at 300 K and 17 atm. The activity coefficient for carbon dioxide in the liquid is described by In i RT (1) where A = 435 cal/(mol K). Find the liquid phase mole fraction of carbon dioxide. The pure-component vapor pressures at 300 K are 71.5 atm for carbon dioxide and 10.1 atm for propane.