Chemistry (7th Edition)

Published by Pearson
ISBN 10: 0321943171
ISBN 13: 978-0-32194-317-0

Chapter 2 - Atoms, Molecules, and Ions - Worked Example - Page 54: 11


There are $0.0487$ mol, or $2.93 \times 10^{22}$ atoms of platinum in 9.50 g.

Work Step by Step

Atomic weight of platinum (Pt): 195.08; therefore, the molar mass is: $195.08$ $g/mol$ $9.50$ $g$ $\times \frac{1mol}{195.08g} = 0.0487$ $mol$. Now, find the number of atoms: $0.0487$ $mol \times \frac{6.022 \times 10^{23}}{1 mol} = 2.93 \times 10^{22}$ atoms.
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