Carbon reacts with oxygen to produce carbon dioxide CO sub 2 times g , Δ⁢H_f=−393.5kJ/mol according to the equation. cap c times s plus 2 cap o sub 2 g rightarrow CO sub 2 times g What is the enthalpy change of the reaction? Use Δ⁢H_rxn=∑(Δ⁢H_f_1p⁢r⁢o⁢d⁢u⁢c⁢t⁢s)−∑(Δ⁢H_f_1r⁢e⁢a⁢c⁢tan⁡t⁢s)