Water decomposes by absorbing 286.2 kJ of electrical energy per mole. When `H_(2)` and `O_(2)` combine to form one mole of `H_(2)O, 286.2kJ` of heat is produced. Which law is proved ? What statement of the law followsfrom it?
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Law of conservation of energy ( or 1st law of thermodynamics)
Def.Energy can neither be created or destroyed , although it may be converted from one formto another.