A certain coal is pulverized and burnt in a burner. Analysis of coal showed 70% C, 10.7% ash and 1.2% N. The refuse is substantially free of combustible. A sample of the flue gas collected and analyzed in an orsat apparatus over mercury contains 8.3% CO2, 3.32% CO, 0.32% SO2, 3.32% H2 and 9.53% O2. Air supplied is at 30 deg C, 1 atm and saturated with water. Calculate:  a) % excess O2 b) Complete ultimate analysis of coal

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