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Q19. The mass analysis of a fuel is: carbon 80%; hydrogen 17%; sulphur 2.1%; water 3%. (remainder ash).

Determine EACH of the following:

(a) The theoretical air/fuel ratio by mass; (6)

(b) The volumetric analysis of the dry products (i.e excluding H₂O and soluble SO₂) when the fuel is burned completely in 25% excess air; (6)

(c) The dew point temperature of the combustion products if the total pressure is 1.01 bar.(4)

Note:  Atomic mass relationships: H = 1; C = 12; O = 16; N = 14; S = 32

Air contains 21% oxygen by volume and 23.3% oxygen by mass.