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Bond Order and Enthalpy

Heat evolved ...

Question

Heat evolved in the reaction $H_{2} + {C l}_{2} ⟶ 2 H C l$ is 182 kJ. Bond energies pf H-H and Cl-Cl are 430 and 242 KJ/mol respectively. The H-Cl bond energy is:

A

245 k J {m o l}^{- 1}

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B

247 k J {m o l}^{- 1}

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C

336 k J {m o l}^{- 1}

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D

154 k J {m o l}^{- 1}

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Solution

The correct option is A $245 k J {m o l}^{- 1}$
Let bond energy of $H - C l$ is $^{'} x^{'}$ :
Total energy, $182 K J = 430 + 242 - 2 x 2 x = 672 - 182 2 x = 490 x = 245$
$∴ H - C l$ bond energy is $245 K J / m o l$ .

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