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Q. For the reaction,
$ 2H_{2}(g) +O_{2} (g) \to 2H_2O(g) $ , $ \Delta H^{\circ} = -573.2\,kJ $
The heat of decomposition of water per mole is

MHT CETMHT CET 2007

Solution:

Heat of decomposition of water is

$H _{2} O (g) \longrightarrow H _{2}(g)+\frac{1}{2} O _{2}(g)$

$\Delta H =\frac{+573.2}{2}$

$= 286.6 kJ / mol$