Chapter 15, Problem 81E

Consider the reaction:

${\text{H}}_{\text{2}}\left(\text{g}\right)+{\text{I}}_{\text{2}}\left(\text{g}\right)\rightleftharpoons \text{2HI(g})$

A reaction mixture at equilibrium at 175 K contains ${\text{P}}_{{\text{H}}_{\text{2}}}$ = 0.958 atm, ${\text{P}}_{I_{\text{2}}}$ = 0.877 atm, and P_HI = 0.020 atm. A second reaction mixture, also at 175 K. contains ${\text{P}}_{{\text{H}}_{\text{2}}}$ = ${\text{P}}_{I_{\text{2}}}$ = 0.621atm, and P_HI = 0.101 atm. Is the second reaction at equilibrium? If not, what will be the partial pressure of Hl when the reaction reaches equilibrium at 175 K?