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Gasoline has an enthalpy of combustion 2...

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`)

A

34.45 kg

B

80.383 kg

C

22 kg

D

224 kg

Text Solution

Verified by Experts

The correct Answer is:
B
`q=mxxcxxDeltaT, m =q//(cxxDeltaT)`
`=(24 xx 10^(6)xx0.7)//(4.18xx50)`
`=80383 " g or "80.383 " kg"`
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Knowledge Check

  • When water is heated from 0^(@)C to 10^(@) C, its volume

    A
    increases
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