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JEE Mains · Chemistry · STD 11 - 5. Thermodynamics and thermochemistry

जब एक मोल हेप्टेन \((1)\) का दहन \(T\) ताप पर किया जाता है तो \(\Delta H\) तथा \(\Delta U\) का अन्तर, \((\Delta H -\Delta U )\), निम्न के बराबर होगा 

  1. A \(-4\,RT\)
  2. B \(-3\,RT\)
  3. C \(3\,RT\)
  4. D \(4\,RT\)
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Answer & Solution

Correct Answer

(A) \(-4\,RT\)

Step-by-step Solution

Detailed explanation

\({C_7}{H_{16}}(l) + 11{O_2}(g) \to 7C{O_2}(g) + 8{H_2}O(l)\) \(\Delta {n_g} = {n_p} - {n_r}\) \( = 7 - 11 = - 4\) \(\because \,\Delta H = \Delta U + \Delta {n_g}RT\) \(\therefore \,\Delta H - \Delta U = - 4\,RT\)
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