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Question

the value of the kc for the reaction 2hi gives h2 +i2 is 1*10^-4. at a given time the composition of reaction mixture is [hi] = 2*10^-5 mol , h2 = 1*10^-5mol i2 = 1*10^-5mol in which direction the reaction will proceed??

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Solution

Dear student

2HI <==> H2 + I2 Kc = 1*10-4

After time t, [HI] = 2*10-5 mol, H2 = 1*10-5 mol, [I2] = 1*10-5 mol.
So after time t, Kc = [H2] I2HI2
Kc = ( 1*10-5) ( 1*10-5) / ( 2*10-5 )2
Kc = 0.25

The value of the equilibrium constant is increases, so the reaction will shift in the backward direction to achieve the equilibrium state.

Regards


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