In Haber process 30 litres of dihydrogen and 30 litres of dinitrogen were taken for reaction which

yielded only 50% of the expected product. What will be the composition of gaseous mixture under the

aforesaid condition in the end? 

(1) 20 litres ammonia, 20 Iiters nitrogen, 20 litres hydrogen

(2) 10 litres ammonia, 25 litres nitrogen, 15 litres hydrogen

(3) 20 litres ammonia, 10 litres nitrogen, 30 litres hydrogen

(4) 20 litres ammonia, 25 litres nitrogen, 15 litres hydrogen