42. Solving a chemistry problem

5. Hydrogen is introduced into a vessel containing a certain amount of solid iodine. The vessel is sealed and heated to 718K. After equilibrium, the gas mixture contained 62.33% (vol.) HI; 35.48% (v/v) H2 and 2.19% (v/v) I2. Determine the equilibrium constant of the reaction H2+I2=2HI and the degree of dissociation of HI at this temperature.