Determine the partial pressure of the water vapor in the

Question

The volume fractions of the gases in the atmosphere of Mars measured at the surface of the planet, where the total atmospheric pressure is 0.112 psia, were found by the early Viking I mission to be 95.0% CO₂, 2.50% N₂, 2.00% Ar, 0.400% O₂, and 0.100% H₂O. Determine

a. The partial pressure of the water vapor in the Martian atmosphere.

b. The mass fractions of all the gases in the Martian atmosphere.

c. The humidity ratio of the Martian atmosphere (consider the Martian dry "air" to be everything in its atmosphere except the water vapor).