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Thermo chemical equation representing the standard enthalpy of formation of water is

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$H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l)$

$H_{3} O^{+} (aq) + {OH}^{-} \to 2 H_{2} O (l)$

$H^{+} (aq) + {OH}^{^{_}} (aq) \to H_{2} O (l)$

$2 H_{2} (g) + O_{2} (g) \to 2 H_{2} O$

answer is A.

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1 mole of water should be formed from its constituent elements

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