calorific value of wood is 18000
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According to the question, 1kg of wood gives 18000 kJ of energy (18000 kJ/kg). Therefore, 1 kilojoule of energy comes from 1/18000kg of wood. So for 108000 kJ of energy, 1/18000 *108000 = 6 kg.
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Calorific val. Of wood =18000kj/kg. 108000/18000= 6kg of wood.
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