Chemistry: The Molecular Nature of Matter and Change 7th Edition

Published by McGraw-Hill Education
ISBN 10: 007351117X
ISBN 13: 978-0-07351-117-7

Chapter 13 - Problems: 13.96

Answer

24.1 torr

Work Step by Step

The vapor pressure of a solution is calculated with Raoult's law Psolution = Xsolvent * Psolvent where Xsolvent represents the mole fraction of the solvent and Psolvent is the vapor pressure of water in torr. To calculate the mole fraction of the solvent calculate the amount of moles of solute (C3H8O3 = 34.0g * (1 mole / 92.09382g) = 0.369189 mol. We're also going to need to convert H2O to moles to perform this calculation. 515.0g * (1 mole / 18.015g) = 28.58684 mol. (28.58684mol / 28.58684 - 0.369189) = 1.01308 * 23.76 torr = 24.1 torr
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