Chemistry: The Molecular Science (5th Edition)

Published by Cengage Learning
ISBN 10: 1285199049
ISBN 13: 978-1-28519-904-7

Chapter 2 - Chemical Compounds - Questions for Review and Thought - Topical Questions - Page 90d: 87a


Molar mass of PbS = $239.3\,g/mol$ Mass percent of Pb= $86.60\%$ Mass percent of S= $13.40\%$

Work Step by Step

Molar mass of PbS= Molar mass of Pb+ Molar mass of S $=207.2\,g/mol+ 32.065\,g/mol$ $= 239.3\,g/mol$ Mass percent of Pb=$ \frac{207.2\,g}{239.265\,g}\times100\%$ $=86.60\%$ Mass percent of S= $\frac{32.065\,g}{239.265\,g}\times 100\%$ $=13.40\%$
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