How much energy will $1 k g$ mass of wood yield on complete combustion, if its calorific value were $18 k J g^{- 1}$ ?

18 MJ

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20 MJ

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10 MJ

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30 MJ

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Solution

The correct option is B 18 MJ
The calorific value of wood is given as $18 k J g^{- 1}$ . This means, $18 k J$ of energy is released by burning $1 g$ of wood. Therefore, by burning $1 k g (1000 g)$ of wood, the energy released would be $Q =$ mass of fuel $\times$ calorific value
$= 1000 \times 18 k J = 18 M J$ .

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