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\[ C(s) + O_2(g) \rightarrow CO_2(g) \]  \(\Delta H_1 = -393,5 \, \text{kJ/mol}\)

\[ CO_2(g) \rightarrow CO(g) + \frac{1}{2} O_2(g) \]  \(\Delta H_2 = +283,0 \, \text{kJ/mol}\)