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10 pts Question 3 a) Explain the reason why heat is released when a hydrocarbon fuel...
10 pts Question 3 a) Explain the reason why heat is released when a hydrocarbon fuel is burned in a combustion chamber. b) Why excess alr is necessary to use in an actual combustion? Explain. c) n - Dodecane (C12H%) in gas form is burned in a combustion chamber with 150% excess air. Determine the following: 1) the chemical reaction equation showing all reactants and products. ii) the required air to fuel ratio by mass, AF. Agir ky fuel ut the rate of fuel consumed if 300 kg of air per minute is supplied to the combustion, (he fuel 1) find if there will be condensation when the products are discharged to the atmosphere at 45°C, 101 kPa. Give your reasons. min Molar mass: H: 1 amu, 0:16 amu, C: 12 amu, N:14 amu
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heat on (a) by the definition of hydrocenban fuel, Hi fuel is that which gives burning because Caubon react with Oxygen to give Carbon dioxde and heat Energy. similarly with Hydrogen it reactwuith Oxygen to give water but the heat release by Cop is received by water to form water vabon. b. excers air is necessary for Complete Combustion of fuel because due to inert present in the air Stoichiometric amount of air is not sufficient for Complete Combustion ( 1) 42 H 26 +370 → 1220, + 13H2O 2 ") 302 kg of oceo sagte air/fuel ratio I mol of C12H26 required 37 mole Oz but 150% excess a is used 8. On supplied = (1+15) x 37 = 16:25 ond) 21 mol O Contained in Imol ai 46025 molog Contained in 2-2 mol air air/ fuel ratio 2.2 22.2
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