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The mole fraction of HCl in 20 percent aqueous solution is 0.21.

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The mole fraction of HCl in a 20% aqueous solution can be calculated by converting the percentage to a molarity concentration. Assuming the density of the solution is 1 g/mL, a 20% solution means 20g of HCl in 100g of solution. If the molar mass of HCl is 36.5 g/mol, we can calculate the molarity and then use it to find the mole fraction of HCl in the solution.

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Q: Calculate the mole fraction of HCl in 20 percent aqueous solution?
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