Question

The density of copper metal is 8.95g/cm^3.If the radius of copper atom is 127.8pm,is the unit cell simple cubic,bcc or fcc??(amu of cu=63.54g/mol

Answer 1

 We know that density, For SCC: z = 1 and a = 2rFor BCC: z = 2 and For FCC: z = 4 and Substituting the values of z and a in equation (i) we can calculate the value of density.It is given that M = 63.54 g mol−1NA = 6.02 × 1023 mol−1r = 127.8 × 10−10 cmThe given value of density is 8.95 g/cm3. Hence, from the given data, we can conclude that copper unit cell is face centred cubic or fcc.

Answer 2

The density of copper metal is 8.95g/cm3.If the radius of copper atom be127.8pm, is the copper unit cell simple cubic,body centered cubic or face centered cubic?