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4. a. Use the following reaction and table of enthalpies of formation to determine the standard enthalpy of formation of carbon monoxide. $Cr_2O_3(s) + 3CO(g) \to 2Cr(s) + 3CO_2(g)$ $\Delta H^\circ_{rxn} \approx 290.7 kj/mol$ \begin{tabular}{|l|c|c|} \hline Substance & $\Delta H^\circ$ (kJ/mol) & $C_{p,m}$ (J/Kmol) \\ \hline $CO_2(g)$ & -393.5 & 37.11 \\ $CO_2(s)$ & -427.7 & 13.78 \\ $CO(g)$ & ? & 29.14 \\ $Cr_2O_3(s)$ & -1139.7 & 34.18 \\ \hline \end{tabular} b. Use the heat capacities in the above table to calculate the enthalpy of reaction at 350K.

          4. a. Use the following reaction and table of enthalpies of formation to determine the standard
enthalpy of formation of carbon monoxide.
$Cr_2O_3(s) + 3CO(g) \to 2Cr(s) + 3CO_2(g)$  $\Delta H^\circ_{rxn} \approx 290.7 kj/mol$

\begin{tabular}{|l|c|c|}
\hline
Substance & $\Delta H^\circ$ (kJ/mol) & $C_{p,m}$ (J/Kmol) \\
\hline
$CO_2(g)$ & -393.5 & 37.11 \\
$CO_2(s)$ & -427.7 & 13.78 \\
$CO(g)$ & ? & 29.14 \\
$Cr_2O_3(s)$ & -1139.7 & 34.18 \\
\hline
\end{tabular}
b. Use the heat capacities in the above table to calculate the enthalpy of reaction at 350K.

4. a. Use the following reaction and table of enthalpies of formation to determine the standard
enthalpy of formation of carbon monoxide.
Cr2O3(s) + 3CO(g) → 2Cr(s) + 3CO2(g) Δ H^∘rxn≈ 290.7 kj/mol

Substance Δ H^∘ (kJ/mol) Cp,m (J/Kmol)

CO2(g) -393.5 37.11

CO2(s) -427.7 13.78

CO(g) ? 29.14

Cr2O3(s) -1139.7 34.18

b. Use the heat capacities in the above table to calculate the enthalpy of reaction at 350K.

Added by William V.

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