Chemistry (4th Edition)

Published by McGraw-Hill Publishing Company
ISBN 10: 0078021529
ISBN 13: 978-0-07802-152-7

Chapter 15 - Section 15.4 - Using Equilibrium Expressions to Solve Problems - Checkpoint - Page 689: 15.4.4


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.
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