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

\(25^{\circ} C\) ताप तथा \(1\) वायुमण्डलीय दाब पर, बेंजीन \((1)\) एवं एसिटीलीन के दहन एन्थैल्पी क्रमश: \(-3268 kJ mol ^{-1}\) एवं \(-1300 kJ mol ^{-1}\) है, तो निम्न अभिक्रिया के लिए एन्थैल्पी में परिवर्तन \(.....\,kJ \,mol ^{-1}\) होगा \(3 C _2 H _2( g ) \rightarrow C _6 H _6( l )\)

  1. A \(+\,324\)
  2. B \(+\,632\)
  3. C \(-\,632\)
  4. D \(-\,324\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(-\,632\)

Step-by-step Solution

Detailed explanation

\(\Delta H =\sum \Delta H _{\text {Combustion }}\) (Reactant) \(-\sum \Delta H _{\text {Combustion }}\) (Product) \(=3 \times(-1300)\,-\,[-3268]\) \(=-632\, kJ\, mol ^{-1}\)
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