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For the thermochemical equation, 2H(2(...

For the thermochemical equation,
`2H_(2(g)) + O_(2(g)) rarr 2H_(2)O_(l) , Delta H = - 571.6 kJ`
Heat of decomposition of water is :

A

`- 571.6 kJ`

B

`+ 571.6 kJ`

C

`- 1143.2 kJ`

D

`+ 285.8 kJ`

Text Solution

Verified by Experts

The correct Answer is:
D
`2H_(2) (g) + O_(2) (g) rarr 2H_(2)O (l) , Delta H = - 571.6 kJ`
or `H_(2)(g) + O_(2)(g) rarr H_(2)O(l), Delta H = (-571.6)/(2) = - 285.8 kJ`
For decomposition of water
`H_(2)O(l) rarr H_(2)(g) + O_(2) (g) Delta h = + 285.8 kJ`
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