Question

The atomic weight per 1 mol of copper (Cu) with face-centered
cubic (fcc) structure and the density at 298K are 63.54 g and 8.89*10^6 g/m3,
respectively. Estimate the nearest-neighbor distance of Cu atoms.

Answer 1

Soutou: → Atomie weight þer I mot of wise molar mass of Cu = 63.54 glucot density = 8.89x1066/ mies -7 tu Fri Cubic structure - -(1) nearest neighbour listauls (dl) = vza ube where a = unit edge length of an . We know that, density of unit cell density of und ZM NA Q3 where a= no. of ato (lattleeft Z = no. of atoms per unit cell . ie for F.cc = At corner & Fall catre YU +*6 = 4 M = Molar mass NA = Aragadro no. - so þ- Zm No 03 zm - 4 x 63.54 6.02 X16X03:09 x106 a 4.14-9 400-29 153/1749 X20-30 1 a=3.62410 me

- Frony equation ell, d= [2 a x 3.62x16 d=2.559 x 10 lowe