The face centered cubic cell of platinum has an edge length of \( 0.392 \mathrm{~nm} \). Calcula...

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The face centered cubic cell of platinum has an edge length of \( 0.392 \mathrm{~nm} \). Calculate the density of platinum \( \left(\mathrm{g} / \mathrm{cm}^{3}\right) \) : (Atomic mass : \( \mathrm{Pt}=195 \) )
(a) \( 20.9 \)
(b) \( 20.4 \)
(c) \( 19.6 \)
(d) \( 21.5 \)
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