Chemistry and Chemical Reactivity (9th Edition)

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

Chapter 13 Solutions and Their Behavior - Study Questions - Page 505c: 57


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Work Step by Step

The number of moles of DMG: $53.0\ g\div 116.12\ g/mol=0.456\ mol$ The number of moles of ethanol: $525\ g\div 46.07\ g/mol= 11.40\ mol$ a) Mole fraction: $0.456/(0.456+11.40)=0.038$ b) Molality: $0.456\ mol\div (525/1000)kg=0.87\ m$ c) At the normal boiling point, the vapor pressure of pure ethanol is 1 atm $\Delta P=-X_{solute}P^0=-0.038\times 1\ atm=-0.038\ atm$ Vapor pressure: $1-0.038=0.962\ atm$ d) $\Delta T_b=K_bm=1.22^{\circ}C/m\times 0.87\ m=1.06^{\circ}C$ Boiling point: $78.4+1.06=79.46^{\circ}C$
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