In an experiment, 4.5 kg of a fuel was completely burnt. The heat produced was measured to be 1,80,000 kJ. Calculate the calorific value of the fuel (in kJ/kg)?

The calorific value of fuel is the amount of heat produced by the complete combustion of 1 kg of fuel.
Heat produced by 4.5 kg of fuel = 180000 kJ.
Heat produced by 1 kg fuel = 180000/4.5 = 40000 kJ/kg.
Hence, the calorific value of the fuel is 40,000 kJ/kg.