For the following reaction, Kc is 144 at 200°C. If 0.400 mol of both A and B are placed in a 2.00-liter container at that temperature, what will be the concentration of C at equilibrium?
A(g) + B(g) C(g) + D(g)
a. 0.015 M
b. 1.64 M
c. 0.200 M
d. 0.185 M
e. 1.13 M
Answer: d. 0.185 M