Copper crystallises in fcc unit cell with cell edge length of \( 3.608 \times 10^{-8} \mathrm{~c...

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Copper crystallises in fcc unit cell with cell edge length of \( 3.608 \times 10^{-8} \mathrm{~cm} \). The density of copper is \( 8.92 \mathrm{~g} \mathrm{~cm}^{-3} \). Calculate the atomic mass of copper.
(1) \( 65 \mathrm{u} \)
(2) \( 63.1 \mathrm{u} \)
(3) \( 31.55 \mathrm{u} \)
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