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Question

The enthalpies for the following reactions at 25oC are given:
12H2(g)+12O2(g)OH(g);ΔH=10.06kcal
H2(g)2H(g);ΔH=104.18kcal
O2(g)2O(g);ΔH=118.32kcal
Calculate the OH bond energy in the OH group.

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Solution

Required equation is
H(g)+O(g)OH(g);ΔH=?
Given:
12H2(g)+12O2(g)OH(g);ΔH=+10.06kcal
H(g)12H2(g);ΔH=52.09kcal
O(g)12O2(g);ΔH=52.16kcal
Adding H(g)+O(g)OH(g);ΔH=101.19kcal

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