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Ch.15 - Chemical Equilibrium
McMurry - Chemistry 8th Edition
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Tutti i libri di testoMcMurry 8th EditionCh.15 - Chemical EquilibriumProblema 43
Capitolo 15, Problema 43

The reaction A2 + B ∆ A + AB has an equilibrium con-stant Kc = 2. The following pictures represent reaction mix- tures that contain A atoms (red), B atoms (blue), and A2 and AB molecules. Three reaction mixtures showing red A atoms, blue B atoms, and A2 and AB molecules for equilibrium analysis.
(a) Which reaction mixture is at equilibrium?

Guida verificata passo dopo passo
1
Step 1: Identify the number of A2, B, A, and AB molecules in each reaction mixture.
Step 2: Calculate the concentration of each species in each mixture. Assume the volume is constant and the same for all mixtures.
Step 3: Use the equilibrium constant expression for the reaction, Kc = [A][AB] / [A2][B], to calculate the equilibrium constant for each mixture.
Step 4: Compare the calculated equilibrium constant for each mixture with the given Kc value of 2.
Step 5: Determine which mixture has a calculated equilibrium constant closest to 2, indicating it is at equilibrium.

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Chemical Equilibrium

Chemical equilibrium occurs when the rates of the forward and reverse reactions are equal, resulting in constant concentrations of reactants and products over time. In this state, the system appears static, but molecular activity continues. Understanding equilibrium is crucial for analyzing reaction mixtures and determining which mixture is at equilibrium.
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Chemical Equilibrium Concepts

Equilibrium Constant (Kc)

The equilibrium constant (Kc) quantifies the ratio of the concentrations of products to reactants at equilibrium for a given reaction at a specific temperature. For the reaction A2 + B ⇌ A + AB, Kc = [A][AB]/[A2][B]. A Kc value of 2 indicates that at equilibrium, the concentration of products is twice that of the reactants, guiding the analysis of the reaction mixtures.
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Equilibrium Constant Expressions

Molecular Representation

Molecular representation visually depicts the composition of a reaction mixture, showing the types and quantities of molecules present. In the provided images, red spheres represent A atoms, blue spheres represent B atoms, and the combinations represent A2 and AB molecules. Analyzing these representations helps identify which mixture aligns with the equilibrium condition based on the Kc value.
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Molecular Polarity
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