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Q7) An unknown hydrocarbon fuel combusts with dry air, the resulting products have the following dry volumetric products, 12% CO₂, 1.5% CO, 3% O₂ and 83.5% N₂.

(a) Calculate the percentage excess air. (10)

(b) Determine the partial pressure of the water vapour and dew point. (3)

(c) Describe the difference between HCV and LCV values. (3)

Note : Atmospheric Pressure is 1.10325 × 105Pa