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 kJ Therefore, heat produced by 1kg of fuel \[=\frac{180000}{4.5}\times 1\text{ }kJ/kg=40,000\text{ }kJ/kg\] Hence, the calorific value of the fuel is 40,000 kJ/ kg.
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