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Water decomposes by absorbing 286.2 kJ o...

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.
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Knowledge Check

  • One mole of methanol when burnt in O_(2) , gives out 723 kJ mol^(-1) heat. If one mole of O_(2) is used, what will be the amount of heat evolved

    A
    723 kJ
    B
    924 kJ
    C
    482 kJ
    D
    241 kJ

  • The heat of formation of H_(2)O_((l)) is -286.2 kJ. The heat of formation of H_(2)O_((g)) is likely to be

    A
    `-286.2 kJ`
    B
    `-290.78 kJ`
    C
    `-335.2 kJ`
    D
    `-242.76 kJ`

  • One molee of methanol when burnt in O_(2) , gives out 723 kJ mol^(-1) of heat. If one mole of O_(2) is used, what will be the amount of heat evovled?

    A
    723 kJ
    B
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    C
    482 kJ
    D
    241 kJ

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