A solution of ethanol CH3CH2OH and water that is 10.% ethanol by mass is boiling at...

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Chemistry

A solution of ethanol CH3CH2OH and water that is 10.% ethanol bymass is boiling at 98.7Â°C. The vapor is collected and cooled untilit condenses to form a new solution.
Calculate the percent by mass of ethanol in the new solution.Here's some data you may need:
normal boiling point density vapor pressure at
98.7Â°C
ethanol
78.Â°C
0.79gmL
1563.torr
water
100.Â°C
1.00gmL
725.torr
Be sure your answer has the correct number of significantdigits.
Note for advanced students: you may assume the solutionand vapor above it are ideal.

Answer & Explanation Solved by verified expert

3.6 Ratings (649 Votes)

Sol As solution is 10 ethanol by mass Mass of ethanol 10 g Mass of water 90 g Molar Mass of ethanol 4607 gmol Molar Mass of water 1801 gmol So Moles of ethanol n1 10 g 4607 gmol 02170 mol Moles of water n2 90 g 1801 See Answer

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	normal boiling point	density	vapor pressure at 98.7Â°C
ethanol	78.Â°C	0.79gmL	1563.torr
water	100.Â°C	1.00gmL	725.torr