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Question

The equilibrium constant K for the reaction H2+I22HI at 700K is 49. What is the equilibrium constant for the reaction HI12H2+12I2 at the same temperature?

A
1.43
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B
0.143
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C
0.49
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D
0.02
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Solution

The correct option is B 0.143
Given H2+I22HI,k=49
For the reaction:
2HIH2+I2,1k=149
For the reaction : HI12H2+12I2
(1k)1/2=(149)1/2=0.143

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