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Question

Kc for is x×1016litre1/2mol1/2,
12N2(g)+12O2(g)+12Br2(g)NOBr(g)
Given that,
2NO(g)N2(g)+O2(g); Kc1=2.4×1030
NO(g)+12Br2(g)NOBr(g); Kc2=1.4litre1/2mol1/2]
100x is__________.

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Solution

2NO(g)N2(g)+O2(g) ......(1).
Kc1=2.4×1030
NO(g)+12Br2(g)NOBr(g) ......(2)
Kc2=1.4litre1/2mol1/2]
Divide first reaction with 2.
NO(g)12N2(g)+12O2(g) ......(3).
Subtract third reaction from second.
12N2(g)+12O2(g)+12Br2(g)NOBr(g) ......(4)
Kc3=Kc1=2.4×1030=1.549×1015.
Kc4=Kc2Kc3=1.4litre1/2mol1/21.549×1015=9.03×1016litre1/2mol1/2=x×1016litre1/2mol1/2
x=9.03
100x=903.

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