A gaseous fuel with a volumetric analysis of 45 percent CH4, 35 percent H2, and 20 percent

Question:

A gaseous fuel with a volumetric analysis of 45 percent CH4, 35 percent H2, and 20 percent N2 is burned to completion with 130 percent theoretical air. Determine
(a) The air-fuel ratio
(b) The fraction of water vapor that would condense if the product gases were cooled to 25oC at 1 atm.