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CBSE Class 8 Science Question 11 of 13

Combustion and Flame — Question 11

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Question

Question 11

In an experiment 4.5 kg of a fuel was completely burnt. The heat produced was measured to be 180,000 kJ. Calculate the calorific value of the fuel.

Answer

Given,

Weight of fuel burnt = 4.5 kg

Amount of heat produced = 180,000 kJ

Calorific value = Amount of heat producedWeight of fuel burnt\dfrac{\text{Amount of heat produced}}{\text{Weight of fuel burnt}}

Substituting we get,

Calorific value = 180,0004.5\dfrac{180,000}{4.5} = 40,000 kJ per kg.

Hence, calorific value of the fuel = 40,000 kJ per kg