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Question

The enthalpies for the following reactions at 25°C are given.
12 H2(g) + 12 O2(g)OH(g); H = 10.06 K cal
H2(g)2H(g); H = 104.18 K cal
O2(g)2O(g); H = 118.32 K cal

Calculate the OH bond energy in the O - H group


A

100.19 K cal

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B

101.19 K cal

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C

-101.19 K cal

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D

-100.19 K cal

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Solution

The correct option is C

-101.19 K cal


H(g) + O(g) O - H(g) Required equation
Given: 12 H2(g) + 12O2(g)OH(g); H=+10.06 K cal
H(g)12H2(g);H=52.09 K cal
O(g) 12 O2(g); H = 59.16 K cal

Adding them we get H(g) + O(g)+ (OH)(g) H = 101.19 K cal


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