Determine the equilibrium constant, K, for the reaction shown below if there are 0.10 moles of all four molecules in a 2.0 L sealed vessel at equilibrium

Question

1. 0.05
2. 1.0
3. 0.10
4. 10
5. 20

Answer 1

A(aq) + B(aq) <==> C(s) + D(aq)

Keq = [D] / [A][B] ... NOTE: in the equilibrium expression, solids are NOT included, so C is absent.

Since the volume is 2 L, the concentrations of each molecule becomes 0.1 mol/2L = 0.05 M

Thus..

Keq = (0.05) / (0.05)(0.05)

Keq = 20 (Answer #5)