Chemistry and Chemical Reactivity (9th Edition)

by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.

Published by Cengage Learning

ISBN 10: 1133949649

ISBN 13: 978-1-13394-964-0

Chapter 2 Atoms, Molecules, and Ions - Study Questions - Page 95k: 157

Answer

Work Step by Step

Number of moles of magnesium sulfate: $0.824\ g\div 120.36\ g/mol=0.00685\ mol$ Number of moles of water: $(1.687-0.824)\ g\div18.015\ g/mol=0.04790\ mol$ Ratio: $0.04790/0.00685=7.00$ 7 molecules of water per formula unit.

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