Solve below with given detail, find unknown by following units and write on white paper but neat & clean;

a) A fuel consists of 72% carbon, 20% hydrogen and 8% oxygen by mass. Determine the stoichiometric or minimum theoretical mass of air required to completely burn 1 kg of this fuel.

b) The analysis by volume of a producer gas is as follows: H2 14%, CH4 2%, CO 22%, CO2 5%, O2 2% and N2 55%. Find the stoichiometric volume of air required for the complete combustion of 1 m3 of this gas.