Calculating Carbon, Hydrogen Content in Solid Fuel

[GG!!]

Hi, I have the following problem, for which I am not sure if i should be making assumptions.

"a solid fuel assumed to consist of carbon and hydrogen only is burnt in air. an analysis of the dry products of combustion yields the following results: Oxygen, 02 = 5.45%
Carbon dioxide, CO2 = 10.71%
Nitrogen, N2 = 83.84%

I need to calculate gravimetric air fuel ratio, carbon & hydrogen content of fuel by mass.

Ive calculated the amount of air required to be 30.6kg for x kg of fuel, but the fuel is causing some problems?
Is the formula simply xCH2 + 0.21y02 + 0.79yN2??

Any help would be greatly appreciated.

Thanks

 

[GCT]

Please show us your approach for calculating the "amount of air" and show all of the information that was included in the original problem.