Answer to Question #54990 in General Chemistry for michelle
Heat = Heat of combustion*Weight
petrol Heat = 0.1 kg*45.58 MJ/kg = 4558 kJ
coal Heat = 0.1 kg*25.58 MJ/kg = 2558 kJ
wood Heat = 0.1 kg*21.14 MJ/kg = 2114 kJ
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