1. In a boiler trial, the percentage composition of coal on mass basis was reported as: C, 88; H2, 3.6; O2, 4.8; and ash, 3.6. The percentage composition of dry flue gases by volume was reported as: CO,. 10.9; CO, 1; 02, 7.1; and N2, 81 Find, (a) the mass of air actually supplied per kg of coal, and (b) the percentage of excess air supplied.

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