Question detail
Write the expression for the equilibrium constant Kc for the following reaction: A(g) + 2B(g) ⇌ 3C(g) (A-level cue c7bcac1a focus)
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Chemical equilibria, Le Chatelier's principle and Kc
Question
Write the expression for the equilibrium constant Kc for the following reaction: A(g) + 2B(g) ⇌ 3C(g) (A-level cue c7bcac1a focus)
Answer
Kc = [C]^3 / ([A][B]^2). This answer is anchored to Equilibrium constant Kc. This version is uniquely anchored to Equilibrium constant Kc. Retrieval anchor: A-level cue c7bcac1a.
Explanation
Kc = [C]^3 / ([A][B]^2). This answer is anchored to Equilibrium constant Kc. is correct because it supports the objective: Construct Kc expressions for homogeneous equilibria.. The reasoning stays within Equilibrium constant Kc and avoids drifting into a similar A-Level Chemistry idea. This version is uniquely anchored to Equilibrium constant Kc. Retrieval anchor: A-level cue c7bcac1a.
Common mistake
Incorrect Kc Expression Construction
Students often confuse the products and reactants when constructing Kc expressions, leading to incorrect formulas.
To construct the Kc expression, use the formula Kc = [products]^[coefficients] / [reactants]^[coefficients]. For example, for the reaction aA + bB ⇌ cC + dD, the correct expression is Kc = [C]^c [D]^d / [A]^a [B]^b. Substitute the equilibrium concentrations into the formula and calculate Kc.
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