29. During a boiler trial, the dry flue gas analysis by volume was reported as CO2=0.38m3, excess O2=0.395m3, and N2=4.55m3. The coal analysis by mass was reported as C=62.4%,H2=4.2%,O2= 4.5%, moisture =15%, Ash =13.9%. Determine the minimum air required to burn 1kg of coal. a. 7.3kg b. 8.5kg c. 6.1kg d. 9.4kg