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60 MJ energy is produced on combustion of 2 kg of coal. Find how much energy is produced on burning 0.5 kg of coal. Also find the calorific value of c

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60 MJ energy is produced on combustion of 2 kg of coal. Find how much energy is produced on burning 0.5 kg of coal. Also find the calorific value of coal.
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(i) Definition of calorific avlue .
(ii) Calorific value is constgant for a given substance.
(iii) Q=mc
(iv) `Q prop m`
(v) `30 kJ g^(-1) , 15 mJ`
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