Determine the fuel model cnhm- the composition of the fuel

Question

An Orsat analysis of the (dry) products of combustion of an unknown hydrocarbon indicates that it consists of only 26.1% CO and 73.9% N₂, with no CO₂ or O₂ present. Determine

a. The fuel model (C_nH_m).

b. The composition of the fuel on a percent mass basis.

c. The percent theoretical air used.

d. The dew point temperature of the combustion products at atmospheric pressure.