Question

calorific value of wood is 18000 kj/kg. how much wood is required to produce 360000 kj of heat energy?

Answer 1

By unitary method,

1kg=18000kJ
xkg=360000kJ
 
∴x=360000*1/18000⇒20kg

Answer 2

Explanation:

18000kj/kg of heat energy is produced by burning 1kg of wood.

heat energy is produced by burning 1/18000 of wood.

= 360000 kj of heat energy =1/18000×360000

= 20 kg.

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