See answer below.
Work Step by Step
At the equilibrium, the rate of the forward reaction is the same as the backward reaction, i.e. in the same unit of time for every pair of $H_2, I_2$ formed, one is consumed into 2 $HI$ molecules.
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.