What is the mass and volume of ethanol per g / cm3?
Answers
Answer:
The mass percent of ethanol is 10.1 %.
Explanation:
Percent of alcohol by volume (ABV) is the volume of ethanol in
100 cm ³ of solution.
For example, the volume of
12.5 cm
3
of ethanol plus
87.5 cm ³ of water is only 97.8 cm³.
The density of 12.5 % ABV at 20 °C is 0.9784 g/cm³
Now, we can calculate the mass percent of the ethanol.
Mass of ethanol = 12.5 cm³ ethanol × 0.789 g ethanol/ 1cm³ ethanol
= 9.826 g ethenol
mass of wine= 100 cm³ x 0.9784 g ethenol/ 1 cm³ wine
= 97.84 g solution
% by mass = mass of ethenol/ mass of wine x 100
= 9.862 g/97. 84 g x 100
= 10.1%
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