Calculate the stoichiometric air-fuel ratio for the combustion of a sample of dry anthracite of the following compositio

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Calculate the stoichiometric air-fuel ratio for the combustion
of a sample of dry anthracite of the following composition by mass:
C = 92.5 per cent; H2 = 3 per cent ; N2 = 1 per cent ; Sulphur =
0.5 per cent ; ash = 3 per cent. Molecular weights C-12,
H2-2, N2 -28, S-32,
O2-32. Air contains 23.3% oxygen and 76.7% nitrogen
If 20 per cent excess air is supplied determine:
(i)Actual Air-fuel ratio
(ii) Wet analysis of the products of combustion by volume
(neglect the ash).