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 - 13-1 Units of Concentration - Review & Check for Section 13-1 - Page 473: 1


B and B

Work Step by Step

The molar mass of water: $1.008|_H\times 2+15.999|O=18.015\ g/mol$ The number of mols of water: $270\ g\div18.015\ g/mol=14.988\ mol$ The molar fraction of urea: $1.0/(1.0+14.988)=0.0625$ Molality: $1.0\ mol\ urea/0.27\ kg\ water=3.70\ molal.$
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