When 1 mole of N₂ and 1 mole of H₂ is enclosed in 3 L vessel and the reaction is allowed to attain equillibrium ,it is found that at equillibrium there is x number of mole of H₂. The number of moles of NH₃ formed would be:
a. 2x/3
b. 2(1+x)/3
c. 2(1-x)/3
d. (1-x)/3