A mixture initially containsA,B, andCin the following concentrations:[A]= 0.300M,[B]= 0.800M, and[C]= 0.450M. The following reaction occurs and equilibrium is established:
A+2B?C
At equilibrium,[A]= 0.200Mand[C]= 0.550M. Calculate the value of the equilibrium constant,Kc.