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Q3. A pure hydrocarbon fuel is burned in air. The mass analysis of the dry combustion is 5.13 kg of CO₂, 1 kg CO, 1.8 kg O₂, 25.23 kg N₂. Calculate EACH of the following:

(a) the mass analysis of the fuel; (8)

(b) the percentage excess air by mass; (4)

(c) the molecular mass of total combustion products. (4)

Note: atomic mass relationships H = 1, C = 12, O = 16, N = 14. air contains 23.3% oxygen by mass.