The numerical value of the equilibrium constant, Kc, for the following gas phase reaction is 0.50 at a certain temperature. When a certain reaction mixture reaches equilibrium, the concentration of O2 is found to be 2.0 M, while the concentration of SO3 is found to be 10 M. What is the equilibrium concentration of SO2 in this mixture?
2SO2 + O2 2SO3
a. 0.50 M
b. 10 M
c. 0.10 M
d. 5.0 M
e. 1.0 M
Answer: b. 10 M