Which of the following reactions corresponds to the definition of enthalpy of formation?

Which of the following reactions corresponds to the definition of enthalpy of formation?

A
$C (diamond) + O_{2} (g) \to {CO}_{2} (g)$
B
$C (graphite) + O_{2} (1) \to {CO}_{2} (g)$
C
$C (graphite) + O_{2} (g) \to {CO}_{2} (g)$
D
$C (g) + O_{2} (g) \to {CO}_{2} (g)$

Solution:

C(graphite) is the stable state of aggregation of carbon.

Thus the reactions corresponds to the definition of enthalpy of formation

$C (graphite) + O_{2} (g) \to {CO}_{2} (g)$ .

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