# Chapter 13 - The Chemistry of Solutes and Solutions - Questions for Review and Thought - Topical Questions - Page 605b: 39

90 g

#### Work Step by Step

Total mass of the solution= $Density\times Volume= \frac{1g}{mL}\times750 mL=750g$ $Mass\,percent=\frac{Mass\,of\,the\,component\times100}{Total\,mass\,of\,the\, solution}$ That is, 12%=$\frac{Mass\,of\, ethanol\times100}{750\,g}$ $\implies Mass\,of\, ethanol=$$12\times\frac{750\,g}{100}= 90\,g$

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