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: 101

Answer

a) $1.0552\times10^{-22}\ g$ b) $\$6.3\times10^{-22}/atom$

Work Step by Step

Atomic weight of copper: $63.546\ g/mol$ a) $63.546\ g/mol \div (6.022\times10^{23}\ atoms/mol)=1.0552\times10^{-22}\ g$ b) Number of atoms in the wire: $7.0\ g\ wire \times \frac{99.999}{100}g\ Cu/g\ wire \div (1.0552\times10^{-22}\ g\ Cu/atom) = 6.6\times10^{22} atoms$ Price per atom: $\$41.70\div(6.6\times10^{22} atoms) = \$6.3\times10^{-22}/atom$
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