#### Answer

e. Right, Neither.

#### Work Step by Step

1. Write the equilibrium constant expression:
- The exponent of each concentration is equal to its balance coefficient.
$$K_c = \frac{[Products]}{[Reactants]} = \frac{[ Z ]}{[ X ][ Y ]^{ 2 }}$$
2. Calculate Kc for both mixtures:
Left mixture:
$$ \frac{4}{(4)(4)^2} = 0.0625$$
Therefore, more product has to be formed in order to reach equilibrium. (Kc = 3): Right.
Right mixture:
$$\frac{(9)}{(3)(1)^2} = 3$$
The mixture is already at equilibrium: Neither.