The mineral claudetite contains the element arsenic in the form of arsenic(III) oxide, As₂O₃. The As₂O₃ in a 0.562-g sample of the impure mineral was converted first to H₃AsO₃ and then titrated with a 0.0480 M solution of I₃⁻, which reacts with H₃AsO₃ according to the following balanced net ionic equation

If the titration required 45.7 mL of the I₃⁻ solution, what is the percentage of As₂O₃ in the mineral sample?

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H,AsO₂(aq) + 3 H₂O(l) + 1₂ (aq) → H3ASO₂(aq) + 2 H₂O+ (aq) + 3 1(aq)