Calorific value of wood is 1800 kJ/kg. How much wood is required to produce heat energy of 144,000kJ?

"The calorific value of LPG is 55000 kj/kg". What does it mean ?

The calorific value of a fuel is 40000 kj/kg. This fuel is most likely to be :

'The calorific value of cooking gas (LPG) is 50 kJ/g''. What does it mean ?

The heat of formation of water is 260 kJ . How much H_(2)O is decomposed by 130 kJ heat ?

Bond energy of hydrogen gas is -433 kJ. How much is the bond dissociation energy of 0.5 mole of hydrogen gas?