Q.

The H - H bond energy is 430 kJ mol-1 and Cl - Cl bond energy is 240 kJ mol-1. ∆H  for HCl  is -96 kJ. The H - Cl bond energy is about.

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a

425 kJ mol-1

b

213 kJ mol-1

c

360 kJ mol-1

d

180 kJ mol-1

answer is A.

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Detailed Solution

12H2+12Cl2 →  HCl ∆H=-90 kJ ∴  ∆H= 12 EH-H+ 12 ECl-Cl or  -90 =12 × 430 + 12 ×240-EHCl  ∴  EH-Cl=425 kJ mol-1
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The H - H bond energy is 430 kJ mol-1 and Cl - Cl bond energy is 240 kJ mol-1. ∆H  for HCl  is -96 kJ. The H - Cl bond energy is about.