Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 13 - Properties of Solutions - Exercises: 13.67b

Answer

238.2 torr

Work Step by Step

The vapor pressure of a solution with two components is: P(total) = mole fraction A * VP pure a + mole fraction B * VP pure b We are told the VP of pure water is 175 torr and that of ethanol is 400 torr. Since the mole fraction of ethanol is 0.281 then the mole fraction of water is 1-0.281 = 0.719. Therefore, we have: P = 0.719 * 175 torr + 0.281*400 torr = 238.2 torr
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