1.

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 :

Answer»

`- 571.6 kJ`
`+ 571.6 kJ`
`- 1143.2 kJ`
`+ 285.8 kJ`

Solution :`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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