You have used copper wires in your circuits. Let’s calculate the mobile electron density n for copper. A mole of copper has a mass of 64g (0.064kg), and one mobile electron is released by each atom in metallic copper. The density of copper is about $\mathbf{9}\mathbf{}\mathbf{g}\mathbf{/}{\mathbf{cm}}^{\mathbf{3}}\mathbf{}\mathbf{or}\mathbf{}\mathbf{(}\mathbf{9}\mathbf{\times }{\mathbf{10}}^{\mathbf{3}}\mathbf{}\mathbf{kg}\mathbf{/}{\mathbf{m}}^{\mathbf{3}}\mathbf{)}$. Show that the number of mobile electrons per cubic meter in copper is $8.4\times {10}^{28}{\mathrm{m}}^{-3}$.

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