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JIPMER 2010
Exam
JIPMER
Year
2010
Subject
Chemistry
Chapter
Thermodynamics (C)

JIPMER 2010 · Chemistry · Thermodynamics (C)

What is the Δ H of the reaction The average bond energies of C-Cl...

What is the ΔH\Delta H of the reaction What is the Δ H of the reaction The average bond energies of C-Cl bond and C-H bond are 416 kJ and 325 ~kJ ~mol^ -1 The average bond energies of C−Cl\mathrm{C}-\mathrm{Cl} bond and C−H\mathrm{C}-\mathrm{H} bond are 416 kJ and 325 kJ mol−1325 \mathrm{~kJ} \mathrm{~mol}^{-1} respectively.

Options

  1. A1482 kJ
  2. B1482 J
  3. C1492 kJ
  4. D1492 J

Correct answer

A. 1482 kJ

Step-by-step solution

In the reaction, two moles of C−H\mathrm{C}-\mathrm{H} bonds and two moles of C−Cl\mathrm{C}-\mathrm{Cl} bonds are broken. Hence, energy absorbed =2×416+2×325=1482 kJ\begin{aligned} & =2 \times 416+2 \times 325 \\ & =1482 \mathrm{~kJ} \end{aligned}
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