Question

NCERT VIII - Sciences

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 1

mass of fuel = 4.5 kg
energy produced = 180000 kJ

calorific value of a fuel is the amount of energy released when 1 kg of fuel is burnt completely. So
Calorific value = 180000/4.5 = 40000 kJ/kg = 40 MJ/kg

Answer 2

Answer:

The calorific value of fuel is the amount of heat produced by the complete combustion of 1 kg of fuel.

Now,

Heat produced by 4.5 kg of fuel = 180000 kJTherefore, heat produced by 1Kg of fuel = 180000/4.5 = 1KJ/Kg

= 40,000 kJ/kg

Hence, the calorific value of the fuel is 40,000 kJ/kg.