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Question

If values of ΔHof of ICl(g),Cl(g),I(g) are respectively 17.57,121.34,106.96 J mol 1. The value of ICl (bond energy) in J mol 1 is:

A
17.57
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B
210.73
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C
35.15
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D
106.96
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Solution

The correct option is A 210.73
Gas Values of ΔHf
ICl 17.57
Cl 121.34
I 106.96
I+ClICl
(g) (g) (g)
according to Hess less,
ΔH=ΔHf(reactants) ΔHf(products)
=(106.96+121.34)(17.57)
=210.73 J/mol
Value of ICl (bond energy) in J/mol =210.73 J/mol

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