Find the equilibrium concentrations of A, B, and C for a=1, b=1, and c=2. Assume that the initial concentrations of A and B are each 1.0 M and that no product is present at the beginning of the reaction.

Consider the following reaction and associated equilibrium constant:
aA(g)+bB(g)⇌cC(g), Kc = 4.0

Question

Find the equilibrium concentrations of A, B, and C for a=1, b=1, and c=2. Assume that the initial concentrations of A and B are each 1.0 M and that no product is present at the beginning of the reaction.

Consider the following reaction and associated equilibrium constant:
aA(g)+bB(g)⇌cC(g), Kc = 4.0

anonymous · Answer

So I set it up this way 

  $$4.0 = x ^{2} /(1-x)^{2} $$

= 3x^2 -8x+4 =0

I then use the quadratic equation and get

x= 2/3 

1- (2/3) = .67 

but apparently that's not the answer.

anonymous · Answer

1- (2/3) = .33