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C(s) + O2(g) overset to CO2(g) DeltaH = ...

`C(s) + O_2(g) overset to CO_2(g) DeltaH = -94 kcal`
`CO +1/2 O_2(g) overset to CO_2(g) DeltaH = 135.2 kcal`
The heat of formation of CO(g) is ?

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