Given: \(\mathrm{C(s)+O_2(g)\rightarrow CO_2(g)}\), \(\Delta H=-393.5\) kJ; \(\mathrm{CO(g)+\frac12O_2(g)\rightarrow CO_2(g)}\), \(\Delta H=-283.0\) kJ. The standard enthalpy of formation of CO(g) is

A. \(-676.5\) kJ mol^-1

B. \(-283.0\) kJ mol^-1

C. \(+110.5\) kJ mol^-1

D. \(-110.5\) kJ mol^-1

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Answer: D. \(-110.5\) kJ mol-1

Subtract the second equation from the first: \(\Delta_fH(\mathrm{CO})=-393.5-(-283.0)=-110.5\) kJ mol^-1.

Chemistry Tutor AI · 23 Oct 2026 AI-verified AI-generated Report