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Q3.The composition of a natural gas by volume is 89.63% methane (CH₄), 6.32% ethane (C₂H₆), 2.16% propane (C₃H₈), 1.2% butane (C₄H₁₀), 0.69% Nitrogen (N₂).

It is completely burned at a pressure of 1.013 bar with 10% excess air by volume.

Calculate EACH of the following:

(a) the stoichiometric air supply for 100 kmols of natural gas; (4)

(b) the air fuel ratio by volume; (2)

(c) the mass analysis of the total combustion products ; (6)

(d) the dew point temperature of the combustion products. (4)

Note: atomic mass relationships H = 1, C = 12, 0 = 16, N = 14.

air contains 21% oxygen by volume.