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Q3. A fuel has a mass analysis of 52 % carbon, 15 % hydrogen and 33 % oxygen.

A mass of 1 kg of the fuel is burned in air and the combustion products contain 0.233 kg of CO and 0.581 of O₂.

Use the equations of combustion by mass to calculate EACH of the following:

(a) The mass of carbon burned to CO₂ ;(4)

(b) The percentage excess air by mass ; (6)

(c) The mol fraction of the total combustion products.(6)

Note: atomic mass relationships H = 1 , C = 12 , O = 16 , N = 14

Air contains 23.3 % oxygen by mass.