Cadmium telluride, CdTe, takes the zinc blende structure with a unit cell edge l
ID: 710099 • Letter: C
Question
Cadmium telluride, CdTe, takes the zinc blende structure with a unit cell edge length of 6.49A. There are four cadmium atoms and four tellurium atoms per unit cell.How many of each type of atom are there in a cubic crystal with an edge length of 4nm? Cadmium telluride, CdTe, takes the zinc blende structure with a unit cell edge length of 6.49A. There are four cadmium atoms and four tellurium atoms per unit cell.
How many of each type of atom are there in a cubic crystal with an edge length of 4nm?
Explanation / Answer
Reasoning from density:
V = (4nm)^3 = 64nm^3
D = 5.85g/cm^3 = 5.85 x 10^-21g/nm^3
m = VD = (64nm^3) x (5.85x10^-21g/ nm^3) ] = 3.744x10^-19g.
3.744x10^-19g x [6.02x10^23 formula units / 240.g] = 939.12 formula units
= 939.12 Cd atoms and 939.12 Te atoms