0.6 mole of `NH_(3)` in a reaction vessel of `2dm^(3)` capacity was brought to equilibrium. The vessel was then found to contain 0.15 mole of `H_(2)` formed by the reaction `2NH_(3)(g) hArr N_(2)(g)+3H_(2)(g)`. Which of the following statements is true?

Options

A. `0.15` mole of the original `NH_(3)` had dissociated at equlibrium
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 `NH_(3)` at equlibrium is `0.25` mole per `dm^(3)`

Answer

D