AP EAMCET · Chemistry · Thermodynamics (C)
The boiling point of water at \(1 \mathrm{~atm}\) is \(100^{\circ} \mathrm{C}\). Which among the following is true for vaporisation of water at \(75^{\circ} \mathrm{C}\) ?
- A \(\Delta G_{\text {vap }}^{\circ}>0\)
- B \(\Delta H_{\text {vap }}^{\circ} < 0\)
- C \(K_{\text {vap }}=1\)
- D \(\Delta S_{\text {vap }}^0 < 0\)
Answer & Solution
Correct Answer
(A) \(\Delta G_{\text {vap }}^{\circ}>0\)
Step-by-step Solution
Detailed explanation
According to standard Gibbs free energy equation i.e., \[ \begin{aligned} & \Delta G^{\circ}=\Delta H^{\circ}-T \Delta S^{\circ} \\ & \Delta G^{\circ}=-T \Delta S^{\circ} \\ & \Delta G^{\circ} \propto-T \end{aligned} \] It means \(\Delta G^{\circ}\) is inversely proportional to…
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