The value of Kc for the reaction


The value of Kc for the reaction 2HI (g) ⇋ H2 (g) + I2 (g) is 1 × 10-4

At a given time, the composition of the reaction mixture is

[HI] =2 × 10-5 mol, [H2] =1 × 10-5 mol and [I2] =1 × 10-5 mol. In which direction will the reaction proceed?


Given that Kc = 1×10-4

Kc = [H2][I2]/[HI]2

Qc expresses the relative ratio of products to reactants at a given instant.

Qc = [H2][I2]/[HI]2

= (1×10-5)(1×10-5)/(2×10-4)

Qc = 1/4 = 0.25

Here; QC >KC Reaction will proceed in reverse direction.

Leave a comment


Click here to get exam-ready with eSaral

For making your preparation journey smoother of JEE, NEET and Class 8 to 10, grab our app now.

Download Now