A solid fuel was fired in the furnace supplied with 27 kmol of air. After the batch process, 3 kmol of excess oxygen was found in the dry stack gas, how many kilograms of carbon in the fuel were used up? Air is composed of 21% oxygen and 79% nitrogen. Assume complete combustion.
C + O2 ==> CO2
You had 27 kmol air x 0.21 = 5.67 kmol oxygen initially.
- 3 kmol O2 not used = 5.67-3 = 2.67 kmol O2 used = 2.67 kmol C burned.
2.67 kmol C x 12.01 kg C/kmol C = ?kg C