Question

At a certain temperature, 4.0 mol NH3 is introduced into a 2.0 L container, and the NH3 partially dissociates by the reaction.
2 NH3(g) N2(g) + 3 H2(g)
At equilibrium, 2.0 mol NH3 remains. What is the value of K for this reaction?

Answer 1

See your post above.

Answer 2

Here is the post from above. It helps us if you don't change screen names.
http://www.jiskha.com/display.cgi?id=1326065120