question_answer

0.6 mole of NH3 in a reaction vessel of 2dm3 capacity was brought to equilibrium. The vessel was then found to contain 0.15 mole of H2 formed by the reaction                 \[2N{{H}_{3(g)}}={{N}_{2(g)}}+3{{H}_{2(g)}}\]                 Which of the following statements is true            [KCET 1999]

A)                 0.15 mole of the original NH3 had dissociated at equilibrium

B)                 0.55 mole of ammonia is left in the vessel

C)                 At equilibrium the vessel contained 0.45 mole of \[{{N}_{2}}\]

D)                 The concentration of NH3 at equilibrium is 0.25 mole per dm3