For a solution of ethanol and water at 20°c that has 0.2 mole fraction ethanol, the partial molar volume of water is 17.9 cc/mole and the partial molar volume of ethanol is 55.0 cc/mole. what volumes of pure ethanol and water are required to make 1 liter of this solution? at 20°c the density of ethanol is 0.789 g/cc and the density of water is 0.998 g/cc.

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination. at the turning point, how far is the second student from the destination?