Lesson: Chapter 3 — Mixtures

3.2. The composition of a mixture 2 of 6 Reset answers

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Question 2

250 g of a salt solution is evaporated and 10 g of salt is left. What is the mass fraction of the salt?

A 10 g B 25 C 0.04 D 0.4

The right answer is the one marked above.

0.04. 10 g ÷ 250 g = 1 ÷ 25 = 0.04.

The 250 g was the whole solution, water included. Evaporating the water is what made the mass of the solute measurable at all.

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