Question

2 moles of nh3 when put into priviously evacuated vessel (1 l) ,partially dessociates into n2 and h2 .If at equilibrim 1 mole of nh3 is present the equilibrium constant is

Answer 1

 no of moles                   $2NH_{3}  \implies   3H_{2} + N_{2}$

at t=0                                         2

at t=teq                                     2-x              3x/2        x/2

but as per the question,

2-x =1   ---> x = 1

thus,                                           1                 3/2        ½

 

 

equilibrium constant=     [H2]3 × [N2]/[NH3]2

substituting values.. we get,

equilibrium constant=  33/23  × 1/2=27/16