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Total mass of fuel = 4.5 kg

Total heat produced = 180,000 kJ

Therefore,

Heat produce by burning 1 kg of fuel = 180,000 kJ/4.5 kg = 40,000 kJ/kg.

So, calorific value of fuel = 40,000 kJ/kg.

Answer

Total mass of fuel = 4.5 kg

Total heat produced = 180,000 kJ

Therefore,

Heat produce by burning 1 kg of fuel = 180,000 kJ/4.5 kg = 40,000 kJ/kg.

So, calorific value of fuel = 40,000 kJ/kg.