Give the direction of the reaction, if K ≈ 1.

Question

BlackTom AI · Accepted Answer

Equilibrium constant K quantifies the ratio of product to reactant concentrations at equilibrium. For a general reaction aA + bB ⇌ cC + dD, K = [C]^c [D]^d / ([A]^a [B]^b). The magnitude of K indicates which side is favored: K >> 1 favors products, K << 1 favors reactants, and K ≈ 1 indicates comparable amounts of reactants and products. Step-by-step reasoning: 1) Definition: K = product concentrations (to stoichiometric powers) divided by reactant concentrations (to stoichiometric powers) when the system is at equilibrium. 2) Interpret K ≈ 1: If K = 1 exactly, then [C]^c [D]^d = [A]^a [B]^b at equilibrium. If K is approximately 1, the numerator and denominator are of similar magnitude, so neither side significantly outweighs the other. 3) Relation to reaction direction: The reaction quotient Q has the same form as K. If Q < K, the net reaction proceeds forward to make more products; if Q > K, it proceeds in reverse to make more reactants. At equilibrium Q = K; with K ≈ 1, the system sits near a balance point with no strong net drive in either direction. 4) Temperature effects: Whether raising temperature favors forward or reverse depends on the reaction enthalpy (ΔH). The van ’t Hoff relation shows K changes with temperature, but without ΔH you cannot predict which direction is favored by heating. Why the correct answer is correct: - K ≈ 1 means product and reactant concentrations at equilibrium are comparable, so neither direction is strongly favored. Why the other options are incorrect: - “The forward reaction is favored” would require K >> 1 (not ≈ 1). - “The reverse reaction is favored” would require K << 1. - The temperature-dependent choices assume a sign for ΔH; without that information one cannot deduce how K changes with temperature, so those statements are not justified. Conclusion: Therefore, the correct choice is “Neither direction is favored.” This matches the provided answer.

Give the direction of the reaction, if K ≈ 1.单项选择题

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