**Problem**Reaction: aA(g) + bB(g) <-> cC(g)

Equilibrium Constant (Kc) = 4.0

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.

**What I did** | A | B | C |

Initial Concentration | 1.0M | 1.0M | 0.0M |

Change in Concentration | -x | -x | +x |

Equilibrium Concentration | 1-x | 1-x | x |

4.0=x^2/[(1-x)^2]

4(1-x)^2=x^2

4-4x^2=x^2

5x^2=4

x^2=4/5

x=0.894

Equilibrium Concentrations

A: 1-x=1-0.894=0.106 M

B: 1-x=0.106 M

C: x=0.894 M

But it's wrong...

**Please tell me where I did wrong. Thanks!!**