JEE Mains · Chemistry · STD 11 - 5. Thermodynamics and thermochemistry
For a reaction, \(A(g) \to A(l)\); \(\Delta H = - 3RT\). The correct statement for the reaction is
- A \(\Delta H = \Delta U \ne O\)
- B \(\Delta H = \Delta U = O\)
- C \(\left| {\Delta H} \right| < \left| {\Delta U} \right|\)
- D \(\left| {\Delta H} \right| > \left| {\Delta U} \right|\)
Answer & Solution
Correct Answer
(D) \(\left| {\Delta H} \right| > \left| {\Delta U} \right|\)
Step-by-step Solution
Detailed explanation
\(A(g) \to A(1)\) \(\Delta H = \Delta U + \Delta {n_g}RT\) Given, \(\Delta H = - 3RT\) Here \(\Delta {n_g} = {n_p} - {n_r} = 0 - 1 = - 1\) \(\Delta H = \Delta U - RT\) \( \Rightarrow - 3RT = \Delta U - RT\) \( \Rightarrow - 3RT + RT = \Delta U\) \( \Rightarrow - 2RT = \Delta U\)…
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