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Ch.7 Chemical Reactions: Energy, Rate and Equilibrium
McMurry - Fundamentals of General, Organic, and Biological Chemistry 8th Edition
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoMcMurry 8th EditionCh.7 Chemical Reactions: Energy, Rate and EquilibriumProblema 14b
Capitolo 7, Problema 14b

The following diagrams represent two similar reactions that have achieved equilibrium:
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b. Calculate the value for the equilibrium constant for each reaction.

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Step 1: Identify the chemical equation provided in the diagram. The reaction is A₂ + 3 B ⇌ 2 C₂, where A₂ represents blue molecules, B represents green molecules, and C₂ represents orange molecules.
Step 2: Count the number of molecules for each species in the diagram. For A₂, count the blue pairs; for B, count the green single molecules; and for C₂, count the orange pairs.
Step 3: Write the expression for the equilibrium constant (K_eq) based on the balanced chemical equation. The formula is: K_eq = ([C₂]^2) / ([A₂] × [B]^3), where the concentrations are proportional to the number of molecules.
Step 4: Substitute the counts of molecules into the equilibrium constant expression. Use the counts from Step 2 to represent the concentrations of A₂, B, and C₂.
Step 5: Simplify the expression to calculate the equilibrium constant. Ensure that the values are plugged in correctly and follow the rules of exponents and division.

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Equilibrium Constant (K)

The equilibrium constant (K) is a numerical value that expresses the ratio of the concentrations of products to reactants at equilibrium for a given chemical reaction. It is calculated using the formula K = [C]^c / ([A]^a * [B]^b), where [C], [A], and [B] are the molar concentrations of the products and reactants, and a, b, and c are their respective coefficients in the balanced equation.
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The Equilibrium Constant Concept 1

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. At this point, the system is in a state of balance, and any changes in concentration, temperature, or pressure can shift the equilibrium position according to Le Chatelier's principle.
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Chemical Equilibrium Concept 1

Stoichiometry

Stoichiometry is the calculation of reactants and products in chemical reactions based on the balanced equation. It involves using the coefficients of the balanced equation to determine the proportions of substances involved, which is essential for calculating the equilibrium constant and understanding the relationships between different species in a reaction.
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Stoichiometry
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The following diagrams represent two similar reactions that have achieved equilibrium:

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