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A 5.00 mL sample of an aqueous solution weighs 5.20 g. The water is evaporated off, leaving 0.26 g of residue. If the solute is

A 5.00 mL sample of an aqueous solution weighs 5.20 g. The water is evaporated off, leaving 0.26 g of residue. If the solute is potassium sulfate, calculate the mole fraction of the solute in this solution.

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