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A volume of 60 mL of an alcohol solution that is x % alcohol by mass (density = 0.6 g/cm³) is used to prepare 200 cm³ of a 12 % by mass alcohol solution (density = 0.90 g/cm³). Calculate the mass of alcohol (in g) present in the original 60 mL sample.

1. 3.6
2. 4.8
3. 6.0
4. 21.6

Correct answer: 21.6

Solution

All the alcohol in the diluted product came from the original sample, so the alcohol mass equals 12% of the final 180 g solution = 21.6 g.

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