Answer to Question #50811 in Physical Chemistry for tiff

Question

at 425 degree centigrade temperature the equilibrium constant of this reaction is 52.5.if at initial,1 mol H2 and 0.75 mol I2 reacts, then how much HI will be found in equilibrium at mole unit. the ans is 0.0911 mol. but i cant get the solution. please help. the reaction is

H2+I2=2HI