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Find the work done by a petrol engine on...

Find the work done by a petrol engine on combustion of 1 kg petrol. The efficiency of the engine is 30% and calorific value of petrol is 47 MJ `kg^(-1).`

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The heat energy liberated on combustion of 1 kg petrol is `47xx10^(6) J kg^(-1).` The percentage efficiency is given by
`=("Work done "(W))/("Amount of heat supplied")xx100`
`Q=(30xx47xx10^(6))/(100)`
`=131xx10^(5)=1.31xx10^(7)`J
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