The concentration of KCl in a solution prepared by adding 0.0660 mol of KCl to 1.00 mol of water is % by mass. A) 0.733 B) 0.0130 C) 0.0519 D) 7.33 × 10^-⁴ E) 5.19

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Quizplus · Accepted Answer

To find the % by mass, use the formula: (mass of solute / total mass of solution) × 100. The molar mass of KCl is approximately 74.55 g/mol, so 0.0660 mol of KCl is about 4.91 g. The mass of 1.00 mol of water is about 18.02 g. The total mass of the solution is 4.91 g + 18.02 g = 22.93 g. The % by mass is (4.91 g / 22.93 g) × 100 ≈ 21.41%. However, the closest option to this calculation is E) 5.19, which seems to be a miscalculation in the options provided.

The Concentration of KCl in a Solution Prepared by Adding