A dry mixture of carbon dioxide and nitrogen (30% carbon dioxide and 70% nitrogen by volume) is initially at 90 F and 14.7 psia. Moisture is then added to the mixture until it becomes saturated at 90 F and 14.7 psia. Determine the following quantities:

A. The molar mass of the original, dry mixture

B. The composition (by volume) of the saturated mixture

C. The ratio of the mixture volume when saturated to the mixture volume when dry