Multiple choice

In a chemical reaction, 13.4 litres of HI were formed by the reaction between 8.1 litres of H2 and 9.1 litres of I2 at 3500C. Calculate the Kp for this reaction.

  1. 51.84

  2. 50.01

  3. 60.61

  4. 60.89
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A Correct answer
Explanation

H2 + I2 ----------------->2HI

Let us assume that at equilibrium, x litres of hydrogen reacts with x litres of iodine to form 2x litres of hydrogen iodide.

It is given that 2x = 13.4

Therefore, x = 6.7

Now let us write the given reaction.

 

Initial vol                                                 8.1         9.1          0

Initial moles                                            a              b            0                                                                H2       +  I2     ----------------->2HI

At equilibrium                                        (a-x)        (b-x)         2x                                                       (8.1-6.7)      (9.1-6.7)   13.4

The equilibrium constant of the reaction is given as                [HI]2       Kc = ------------                  (a-x) (b-x)                 (13.4)2       =   ------------                  (1.4) (2.4) = 51.84  

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