Textbook Problem

. The reaction ${\text{H}}_{\text{2}}\left(g\right)+{\text{I}}_{\text{2}}\left(g\right)\rightleftharpoons \text{2HI}\left(g\right)$has $K_{\text{p}}=45.9$at 763 K. A particular equilibrium mixture at 763 K contains HI at a pressure of 4.94 atm and H₂at a pressure of 0.628 atm. Calculate the equilibrium pressure of I₂(g) in this mixture.