Chemistry and Chemical Reactivity (9th Edition)

Published by Cengage Learning
ISBN 10: 1133949649
ISBN 13: 978-1-13394-964-0

Chapter 15 Principles of Chemical Reactivity: Equilibria - 15-6 Disturbing a Chemical Equilibrium - Applying Chemical Principles - Questions - Page 582: 1


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Work Step by Step

a) Molality: $\Delta T_f=K_fm\rightarrow -0.542^{\circ}C=-5.12^{\circ}C/m\times m$ $m=0.106\ m$ Number of moles of the dimer: $0.106\ m\times (10/1000)kg=0.00106\ mol$ Molar mass: $0.503\ g\div 0.00106\ mol=475.2\ g/mol$ b) A portion of the dimer dissociates into two monomers, which causes the molar mass calculated to be lower than the actual.
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