Which of the following reactions corresponds to the definition of enthalpy of formation at 298 K?

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

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

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

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

answer is A.

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Detailed Solution

In the enthalpy of formation, we have stoichiometric number of the desired species equal to one and it appears as the product. Moreover the reactants must be at stable states of aggregation.

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