Q .     The enthalpy for the following reactions `(ΔH°)` at `25°C` are given below

(i) `12 H_2O (g) + 12 O_2(g) → OH (g) ΔH^o=− 10.06` kcal

(ii) `H_2 (g) → 2H(g) ΔH^° = 104.18` kcal

(iii) `O_2 (g) → 2O(g) ΔH^° = 118.32` kcal

Calculate the O-- H bond energy in the hydroxyl radical.

JEE 1981
A

`155.6` kcal

B

`121.3` kcal

C

`112.5` kcal

D

`137.1 `kcal

HINT

Use formula: `ΔH^° = BE` (reactants) `- BE` (products)

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