What is the correct equilibrium constant expression or equation for the reactionH2(g) + Cl2(g) ⇋ 2HCl(g) Question 2Select one:a.b.c. d.Clear my choice

Break Down the Problem

1. Identify the equilibrium constant expression for a chemical reaction.
2. Understand the components of the reaction and how they relate to their concentrations.

Relevant Concepts

• The equilibrium constant $K_c$ for a reaction is expressed as: $K_c = \frac{[\text{Products}]}{[\text{Reactants}]}$
• For a balanced reaction $aA + bB \rightleftharpoons cC + dD$, the expression is: $K_c = \frac{[C]^c [D]^d}{[A]^a [B]^b}$

Analysis and Detail

• The given reaction is: $\text{H}_2(g) + \text{Cl}_2(g) \rightleftharpoons 2\text{HCl}(g)$
• Here, hydrogen ($\text{H}_2$) and chlorine ($\text{Cl}_2$) are the reactants, and hydrochloric acid ($\text{HCl}$) is the product.
• The coefficients in the balanced equation are:
  • For $\text{H}_2$: coefficient = 1
  • For $\text{Cl}_2$: coefficient = 1
  • For $\text{HCl}$: coefficient = 2

Thus, the equilibrium constant expression can be formulated as: $K_c = \frac{[\text{HCl}]^2}{[\text{H}_2][\text{Cl}_2]}$

Verify and Summarize

We established that in the equilibrium constant expression, the concentrations of the products are in the numerator raised to the power of their coefficients, while the concentrations of the reactants are in the denominator also raised to their coefficients.

Final Answer

The correct equilibrium constant expression for the reaction $\text{H}_2(g) + \text{Cl}_2(g) \rightleftharpoons 2\text{HCl}(g)$ is: $K_c = \frac{[\text{HCl}]^2}{[\text{H}_2][\text{Cl}_2]}$