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What is the equilibrium constant (Kc) for the reaction 2A + B ⇌ C? (2022)

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Question: What is the equilibrium constant (Kc) for the reaction 2A + B ⇌ C? (2022)

Options:

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

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

Exam Year: 2022

Solution: 

The equilibrium constant Kc is defined as the concentration of the products raised to the power of their coefficients divided by the concentration of the reactants raised to the power of their coefficients. For the reaction 2A + B ⇌ C, Kc = [C] / ([A]^2[B]).

What is the equilibrium constant (Kc) for the reaction 2A + B ⇌ C? (2022)

Practice Questions

Q1
What is the equilibrium constant (Kc) for the reaction 2A + B ⇌ C? (2022)
  1. Kc = [C] / ([A]^2[B])
  2. Kc = [A]^2[B] / [C]
  3. Kc = [B] / ([A]^2[C])
  4. Kc = [C] / ([B][A])

Questions & Step-by-Step Solutions

What is the equilibrium constant (Kc) for the reaction 2A + B ⇌ C? (2022)
  • Step 1: Identify the reaction. The reaction is 2A + B ⇌ C.
  • Step 2: Recognize that Kc is the equilibrium constant for this reaction.
  • Step 3: Understand that Kc is calculated using the concentrations of products and reactants.
  • Step 4: Write down the formula for Kc: Kc = [products] / [reactants].
  • Step 5: Identify the products and reactants in the reaction. Here, C is the product and 2A and B are the reactants.
  • Step 6: Write the concentrations of the products and reactants. The concentration of C is [C], the concentration of A is [A], and the concentration of B is [B].
  • Step 7: Apply the coefficients from the balanced equation. For 2A, we raise [A] to the power of 2, and for B, we raise [B] to the power of 1 (which is just [B]).
  • Step 8: Combine everything into the Kc formula: Kc = [C] / ([A]^2[B]).
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