#### Answer

a) Lies to the right
b) Lies to the left

#### Work Step by Step

The equilibrium expression is found by taking the concentration of the products raised to their stoichiometric coefficients divided by the concentration of the reactants raised to their coefficients. Since the products are in the numerator, a larger K would mean that hte reaction lies to the right, favoring products and a small K would mean that it lies to the left
a) K = 5 x 10^12, which is large and so lies to the right
b) K = 5.8 x 10^-18, which is small so it lies to the left