Problem

The density of gold is

19\,300 \text{ kgm}^{-3}

, and its molar mass is

197 \text{ gmole}^{-1}

. The density of copper is

8960 \text{ kgm}^{-3}

, and its molar mass is

63.5 \text{ gmole}^{-1}

. a. a i Calculate the number of moles of gold in

1 \text{ m}^3

of gold. ii Hence, calculate the volume taken up by 1 atom of gold. b. b i Calculate the number of moles of copper in

1 \text{ m}^3

of copper. ii Hence, calculate the volume taken up by 1 atom of copper. c. c If we model an atom as a cube, comment on the relative ‘size’ of atoms of gold and copper.

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