Given C + O 2 rightarrow CO 2 with Delta H=-394 kJ/mol and CO + tfrac12 O 2 rightarrow CO 2 with Delta H=-283 kJ/mol, what is Delta H for C + tfrac12 O 2 rightarrow CO?

Given $C + O_{2} \to CO_{2}$ with $Δ H = - 394 kJ/mol$ and $CO + \frac{1}{2} O_{2} \to CO_{2}$ with $Δ H = - 283 kJ/mol$ , what is $Δ H$ for $C + \frac{1}{2} O_{2} \to CO$ ?

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