How to find initial concentration

Question

A+2B=3c

the reaction mixture is samples prior to the equilibrium being reached. It is determined that the reaction must proceed to the left for equilibrium to be reached. When the reaction mixer is sampled at equilibrium the concentrations are A= 0.267mol L-1 B= 0.336mol L-1 C= 0.173mol L-1

what were the concentrations of A,B and C when the reaction mixture was sampled prior to the equilibrium?

Answer 1

Seems like you and Janet K have the same problem and the same typos. Hmmm.....

Anyway, see my answer here:

https://www.wyzant.com/resources/answers/557332/i-need-help-on-finding-the-initial-equilibrium-concentrations