Question

At 100oC, copper(Cu) has FCC unit cell structure with cell edge length xÅ . What is the approximate density of Cu(in g cm⁻³) at this temperature?
[Atomic mass of Cu = 63.55 u]
(A) 205/x³
(B) 105/x³
(C) 211/x³
(D) 422/x³

Answer 1

YOUR ANSWER IS IN THE ATTACHMENT PLZZ REFER TO THE ATTACHMENT

OPTION IS D

Answer 2

Thus the approximate density of cu at 100° C is d = 423.33 /x^3 g/cm^3

Explanation:

Density of cubic unit cell -

d = zM / a^3No\wherein

Where

• d = density of crystal  
• z = no. of effective constituent particles in one unit cell  
• M = molecular weight
• a = edge length of unit cell
• No = 6.022*1023

The FCC unit cell has Z = 4

d = 63.5 x 4 / 6 x 10^23 x x^3 x 10^-24 g / cm^3

d = 63.5 x 4  x 10 / 6 x x^3 g / cm^3

d = 423.33 /x^3 g/cm^3

Thus the approximate density of cu at 100° C is d = 423.33 /x^3 g/cm^3