Chemistry and Chemical Reactivity (9th Edition)

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

Chapter 2 Atoms, Molecules, and Ions - Study Questions: 81

Answer

$66.46\%$ $15.0\ g\ CuS$

Work Step by Step

Atomic weights (g/mol): $Cu: 63.546,\ S: 32.06$ Molar mass of CuS: $95.61\ g/mol$ Mass percent of Cu: $63.546/95.61\times100\%=66.46\%$ For 10.0 g of Cu: $10.0\ g\ Cu\div 0.6646\ g\ Cu/g\ CuS = 15.0\ g\ CuS$
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