Determine (i) the air-fuel ratio on mass basis. (ii) the percent of carbon and hydrogen in the fuel

Question

A hydrocarbon fuel when burned with air gave the following Orsat analysis:

         CO2 – 11.94%,      O2 – 2.26%,  

         CO – 0.41%,         N2  –  85.39%

         Determine

         (i)    the air-fuel ratio on mass basis.

         (ii)   the percent of carbon and hydrogen  in the fuel on a mass basis, and

         (iii)  percent of theoretical air supplied.

Assume air contains 21% oxygen by volume.