The value of ∆H0 for which of the following reactions is referred to as the standard molar enthalpy of formation of carbon monoxide?
1. C(g) + 12 O2(g) → CO(g)
2. C(graphite) + 1/2 O2(g) → CO(g)
3. C(graphite) + O(g) → CO(g)
4. C(g) + O(g) → CO(g)
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