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 - Page 563: 13.100

Answer

79.38 C

Work Step by Step

moles = g/MW = (4.9 g)/(152.14 g/mol) = 0.032207 mols M (molarity) = mols/kg of solvent = (0.032207 mols)/(0.0445 kg) = 0.7238 m vanillin delta T bp = (Kf)(m) = (1.22 C/m)(0.7238 m) = 0.88298 C T (solution) = T (solvent) + delta T = 78.5 C + 0.88298 C = 79.38 C
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