AP EAMCET · Chemistry · Thermodynamics (C)
For a reaction \(2 \mathrm{CO}(\mathrm{g})+\mathrm{O}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{CO}_2(\mathrm{~g})\), \(\Delta_{\mathrm{r}} \mathrm{G}^0=-128 \mathrm{~kJ}\) at \(300 \mathrm{~K}\). If \(\Delta_{\mathrm{r}} \mathrm{S}^0\) of the reaction is \(-40 \mathrm{~J} \mathrm{~K}^{-1}\), calculate \(\Delta_{\mathrm{r}} \mathrm{U}\) of the reaction.
- A \(-137.5 \mathrm{~kJ}\)
- B \(-128 \mathrm{~kJ}\)
- C \(-140 \mathrm{~kJ}\)
- D \(126.2 \mathrm{~kJ}\)
Answer & Solution
Correct Answer
(A) \(-137.5 \mathrm{~kJ}\)
Step-by-step Solution
Detailed explanation
\(\Delta_{\mathrm{r}} \mathrm{G}^{\circ}=\Delta_{\mathrm{r}} \mathrm{H}^{\circ}-\mathrm{T} \Delta_{\mathrm{r}} \mathrm{S}^{\circ}\) or \(-128=\Delta_{\mathrm{r}} \mathrm{H}^{\circ}+\left(300 \times 40 \times 10^{-3}\right)\) or…
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