CHEM 142 February 26 2018Name Consider akera 0solutionofetha

CHEM 142 February 26, 2018Name Consider akera .0%solutionofethanol in waterbyyolume/ the density of sake is 0.955 g/mL) for the next four problems. The density of pure ethanol (CHsCH OH) is 0.789 gmL. Ia (hint: nure ethanol has 1,000,000 ppm of

Solution

15. (3)  

We are given

Percentage Volume of ethanol in sake = 20 %

Thus,

Volume of ethanol in 100 ml of sake = (20 / 100) * (100 ml) = 20 ml

Density of ethanol = Mass of ethanol / Volume of ethanol

0.789 g / ml   = Mass of ethanol / 20 ml

Mass of ethanol = 0.789 * 20 g = 15.78 g