Multiple choice

A solution contains 20 g of solute in 180 g of solvent. If the solvent is water, what is the concentration of the solution in terms of mass by mass percentage?

  1. 11.1%

  2. 22.2%

  3. 10%

  4. 20%
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C Correct answer
Explanation

Mass percentage = (mass of solute / total mass of solution) * 100. Total mass = 20 + 180 = 200 g. Percentage = (20 / 200) * 100 = 10%.

AI explanation

The total mass of the solution is the sum of the solute and the solvent, which is 20 g plus 180 g, yielding 200 g. The mass by mass percentage is calculated by dividing the mass of the solute by the total mass of the solution and multiplying by 100. Therefore, the concentration is (20 g divided by 200 g) times 100, resulting in a 10% concentration.

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