STANDARD Chemistry Equilibrium Constant MCQ Question
At 500 K, the equilibrium constant for the reaction H₂(g) + I₂(g) ⇌ 2HI(g) is 24.8. If 1/2 mol/L of HI present at equilibrium, what are the concentration of H₂ and I₂, assuming that we started by taking HI and reached the equilibrium at 500K?
0.068 mol L⁻¹
1.020 mol L⁻¹
0.10 mol L⁻¹
1.20 mol L⁻¹
Correct Answer
Detailed Explanation
Using the expression Kₑ = [H₂][I₂] / [HI]² and substituting the given values, we find x = 0.10 mol L⁻¹ for the concentrations of H₂ and I₂.
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