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For the reaction: 2A(g) + B(g) ⇌ 3C(g), what is the correct expression for the e

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Question: For the reaction: 2A(g) + B(g) ⇌ 3C(g), what is the correct expression for the equilibrium constant Kc? (2021)

Options:

  1. [C]^3 / ([A]^2[B])
  2. [A]^2[B] / [C]^3
  3. [C]^3 / [A]^2
  4. [B] / [C]^3

Correct Answer: [C]^3 / ([A]^2[B])

Exam Year: 2021

Solution: 

The equilibrium constant Kc is given by the expression Kc = [C]^3 / ([A]^2[B]), where the concentrations are raised to the power of their coefficients.

For the reaction: 2A(g) + B(g) ⇌ 3C(g), what is the correct expression for the e

Practice Questions

Q1
For the reaction: 2A(g) + B(g) ⇌ 3C(g), what is the correct expression for the equilibrium constant Kc? (2021)
  1. [C]^3 / ([A]^2[B])
  2. [A]^2[B] / [C]^3
  3. [C]^3 / [A]^2
  4. [B] / [C]^3

Questions & Step-by-Step Solutions

For the reaction: 2A(g) + B(g) ⇌ 3C(g), what is the correct expression for the equilibrium constant Kc? (2021)
  • Step 1: Identify the balanced chemical equation: 2A(g) + B(g) ⇌ 3C(g).
  • Step 2: Write the expression for the equilibrium constant Kc, which is based on the concentrations of the products and reactants.
  • Step 3: For each product, take its concentration and raise it to the power of its coefficient in the balanced equation. Here, C has a coefficient of 3, so we write [C]^3.
  • Step 4: For each reactant, take its concentration and raise it to the power of its coefficient. A has a coefficient of 2, so we write [A]^2, and B has a coefficient of 1, so we write [B]^1 (which can be omitted).
  • Step 5: Combine these parts into the Kc expression: Kc = [C]^3 / ([A]^2[B]).
  • Equilibrium Constant Expression – The equilibrium constant (Kc) is derived from the concentrations of products and reactants, raised to the power of their stoichiometric coefficients in a balanced chemical equation.
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