Gasoline has an enthalpy of combustion 24000 kJ/mol gallon. When gasoline burns in an automobile engine, approximately 30% of the energy released is used to produce mechanical work. The remainder is lost as heat transfer to the engine's cooling system. As a start on estimating how much heat transfer is required, calculate what mass of water could be heated from 25^(@)C to 75^(@)C by the combustion of 1.0 gallon of gasoline in an automobile?(Given : C(H_(2)O)=4.18 J//g^(@)C)

Gasoline has an enthalpy of combustion 24000 kJ/mol gallon. When gasol

1.	Gasoline has an enthalpy of combustion 24000 kJ/mol gallon. When gasoline burns in an automobile engine, approximately 30% of the energy released is used to produce mechanical work. The remainder is lost as heat transfer to the engine's cooling system. As a start on estimating how much heat transfer is required, calculate what mass of water could be heated from 25^(@)C to 75^(@)C by the combustion of 1.0 gallon of gasoline in an automobile?(Given : C(H_(2)O)=4.18 J//g^(@)C)
Answer» 34.45 KG 80.383 kg 22 kg 224 kg Solution :`q=mxxcxxDeltaT, m =q//(cxxDeltaT)` `=(24 XX 10^(6)xx0.7)//(4.18xx50)` `=80383 " gor"80.383 " kg"`