In a closed system at equilibrium, the following reaction occurs:
A(g) + B(g) <=> C(g) + D(g)
The equilibrium constant (Kc) for this reaction at a specific temperature is 10.0. If 1.0 mol of A and 1.0 mol of B are placed into a 1.0 L container and allowed to reach equilibrium, what is the concentration of D at equilibrium?