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Ch.16 - Chemical Equilibrium
Chapter 16, Problem 22b

Find and fix each mistake in the equilibrium constant expressions. b. CO(g) + Cl2(g) ⇌ COCl2(g) K = [CO][Cl2]/[COCl2]

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Equilibrium Constant Expression

The equilibrium constant expression (K) quantifies the ratio of the concentrations of products to reactants at equilibrium for a reversible reaction. It is formulated based on the balanced chemical equation, where the concentrations of gaseous and aqueous species are included, while solids and liquids are omitted. The general form is K = [products]/[reactants], raised to the power of their stoichiometric coefficients.
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Stoichiometry in Chemical Reactions

Stoichiometry involves the quantitative relationships between the reactants and products in a chemical reaction, derived from the balanced equation. Each substance's coefficient indicates the ratio in which they react or are produced. Understanding stoichiometry is essential for correctly formulating the equilibrium constant expression, as it dictates how concentrations are represented in the equation.
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Gaseous and Aqueous Species in K Expressions

In equilibrium constant expressions, only the concentrations of gaseous and aqueous species are included, while pure solids and liquids are excluded. This is because their activities are defined as 1, meaning they do not affect the equilibrium position. Recognizing which species to include is crucial for accurately calculating the equilibrium constant for a given reaction.
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