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A solution contains 15 g of methanol (methyl alcohol) in a total volume of 100 mL. If the density of the solution is 0.90 g/mL, calculate the mass percentage of methanol in the solution.

1. 16.67 %
2. 15.0 %
3. 13.5 %
4. 18.0 %

Correct answer: 16.67 %

Solution

The mass of the 100 mL solution is density*volume; methanol's mass divided by it gives the mass percent.

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