A solution of ethanol CH3CH2OH and water is boiling at 90.4°C. A sample of the vapor above the solution is cooled until it condenses. This condensed sample is analyzed, and turns out to be 75.% ethanol by mass. Calculate the percent by mass of ethanol in the boiling solution. Here's some data you may need: normal boiling point density vapor pressure at 90.4°C ethanol 78.°C 0.79gmL 1176.torr water 100.°C 1.00gmL 537.torr Be sure your answer has the correct number of significant digits. Note for advanced students: you may assume the solution and vapor above it are ideal.