# Problem: 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)

###### Problem Details

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)