Q43:

43. 
Evaluate Kp for the reaction : H2 + I2  2HI, If 2 moles each of H2 and I2 are taken initially. The equilibrium moles of HI are 2. 
(1) 2.5        (2) 4        (3) 0.25          (4) 1.0

Dear Student

The reaction is -
                                          ​H2    ​ +       ​I2       ​        ​2HI

So,
Moles at t = 0                    2                 2                      0
Moles at equilibrium       (2 -x)          (2 - x)                2x

Thus, 
Kp(nHI)2(nH2) x (nI2)
Here, we have taken 2x = 2 and x = 1
Kp    = (2)2(1) x (1) = 4
So, the correct option is (2).

Regards

 

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