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: 13.98

Answer

See explanation below.

Work Step by Step

dT = kf x m x i dT is Tn - Ts Tn is normal freezing point of solvent Ts is freezing point of solution kf is a constant for the solvent m is molality = moles solute / kg solvent i = van't hoff factor = number of ions the solute dissociates into. if it doesn't dissociate, i = 1. examples. sugar, i = 1.. NaCl, i = 2 for urea Tn water = 0C kf water = 1.86 C / m... m is molality of solute m urea = 0.25 molal i = 1 for urea.. it doesn't dissociate Ts = 0 C - 1.86 C/m x 0.25m x 1 = -0.53 C
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