Question

Suppose that A and B react to form C according to the equation below.

A + 2 B ⇌ C

What are the equilibrium concentrations of A, B and C if 3.0 mol A and 3.0 mol B are added to a 1.0 L flask? Assume that the equilibrium constant for this reaction is Kc = 8.1x1013.

Answer 1

.................A + 2 B ⇌ C
I...............3M......3M.....0
C.............-x..........-2x.....x
E.............3-x.......3-2x.....x

Plug the E line into the Kc expression and solve for x, then evaluate each item in the E line to find the individual concentrations. Post your work if you get stuck.