Acetylene gas (C2H2) at 25 ºC, 1 atm enters a reactor operating at steady state and burns completely with 140% theoretical air entering at 400 K, 1 atm. If the products leave the reactor at 1200 K and assuming air has a molar analysis of 21% O2 and 79% N2, determine: a) air fuel ratio on mass basis, b) the mass fractions of products, c) the dew point temperature, d) heat transfer per kmol of fuel.