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Which of the following expressions correctly represents the equivalent conductance at infinite dilution of Al₂(SO₄)₃? Given that Λ°Al³⁺ and Λ°SO₄²⁻ are the equivalent conductances at infinite dilution of the respective ions.

1. 1/3 Λ°Al³⁺ + 1/3 Λ°SO₄²⁻
2. 2Λ°Al³⁺ + 3Λ°SO₄²⁻
3. Λ°Al³⁺ + Λ°SO₄²⁻
4. (Λ°Al³⁺ + Λ°SO₄²⁻) × 6

Correct answer: 2Λ°Al³⁺ + 3Λ°SO₄²⁻

Solution

The equivalent conductance at infinite dilution is calculated by summing the contributions of all ions, weighted by their stoichiometric coefficients. For Al₂(SO₄)₃, there are 2 Al³⁺ ions and 3 SO₄²⁻ ions, so the correct expression is 2Λ°Al³⁺ + 3Λ°SO₄²⁻.

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