When a mixture of n2 and H2 in the volume ratio of1:5 is allowed to react at100k and 1000 atm pressure ,0.426 mole fraction of nh3 is formed at equilibrium .find kph for the reaction

That's YOUR homework assignment... we don't do your homework, and you would learn NOTHING if we did. Show us your work, and what you think the answer is, and we CAN tell you where you went wrong.