At 100℃, copper (Cu) has FCC unit cell structure with cell edge length of x Å. What is the approximate density of Cu (in g cm-3) at this temperature?
[Atomic Mass of Cu = 63.55 u]1
\({\rm{\;}}\frac{{205}}{{{x^3}}}\)
2
\({\rm{\;}}\frac{{105}}{{{x^3}}}\)
3
\({\rm{\;}}\frac{{211}}{{{x^3}}}\)
4
\({\rm{\;}}\frac{{422}}{{{x^3}}}\)