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At T(k), copper (atomic mass=635 u) has fcc unit cell structure with edge length of x A. What is the approximate density of Cu in g cm^-3 at that temperature? (N_A=6.0 times 10^23 mol^-1) |
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Answer» `42.3/x^3` FCC unit cell is present, Z=4 Edge length = `x A` ATOMIC weight =`63.5 G mol^-1` `becauseDensity , d=(Z times at OMIC weight )/(a^3 times N_A)` where, a= edge length ` d=(Z times at omic weight )/(x^3times6.023 times10^23 times(10^-8)^3)` `=(4 times63.5)/(x^3 times6.023 times10^23 times10^-24)` `d=423.0/x^3` Hence, option (c ) is correct. |
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