Chapter 16, Problem 45E

Consider the reaction:

${\text{H}}_{\text{2}}\left(\text{g}\right)+{\text{I}}_{\text{2}}\left(\text{g}\right)\rightleftharpoons \text{2 HI}\left(\text{g}\right)$
A reaction mixture in a 3.67 L flask at a certain temperature initially contains 0.763 g H₂ and 96.9 g I₂, At equilibrium, the flask contains 90.4 g HI. Calculate the equilibrium constant (K_c) for the reaction at this temperature.