Total amount of heat produced by a fuel having a calorific value of $20$ kJ/kg was found to be $50$ kJ. How much fuel was burnt?

2500 k g

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250 k g

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25 k g

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2.5 k g

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Solution

The correct option is D $2.5 k g$
The calorific value is $20 k J / k g$ . It means that when 1 kg of fuel is burnt, $20 k J$ of heat is released.

The amount of fuel burnt that would release $50 k J$ of heat is :

$\frac{50 k J}{20 k J / k g} = 2.5 k g$

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