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For which of the following equations is the enthalpy change at $25^{0} C$ and 1 atm equal to $∆ H_{f}^{0} ({CH}_{3} OH, l)$

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$CO (g) + 2 H_{2} (g) \overset{}{\to} {CH}_{3} OH (l)$

$CO (g) + 4 H (g) + O (g) \overset{}{\to} {CH}_{3} OH (l)$

$CO (g) + 2 H (g) + O (g) \overset{}{\to} {CH}_{3} OH (l)$

$C (graphite) + 2 H_{2} (g) + \frac{1}{2} O_{2} (g) \overset{}{\to} {CH}_{3} OH (l)$

answer is D.

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Detailed Solution

From the definition of standard enthalpy change of formation, it is the heat released during the formation of 1 mol of a compound at STP from its constituting “element's”.

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