A coal containing 81% C, with a calorific value 32,400 kJ/kg is burnt to produce a flue gas of the following composition: CO2=10.4%, CO= 1.4%, O2= 5.5 % and the rest is nitrogen. Determine the carbon converted to CO per kg coal.
Clues

1. Since flue gas composition is given, assume 100 moles of flue gas as basis. calculate the moles of each gas.

2. All carbon is in CO and CO2. so the fraction of carbon going to CO can be calulated

3. If coal is 100% carbon this would the conversion. Since coal has only 81%, calculate conversion per kg of coa