Question

give the relationship between density and edge length of a cubic crystal

Answer 1

Answer:$d\propto \frac{1}{a^3}$

Explanation:

$d=\frac{Z\times M}{a^3N_A}g/cm^3$

d = density of the unit cell

M = molecular mass

a = edge length cubic crystal

Z = number of atoms in a unit cell.

$N_A=6.022\times 10^{23}$ per mole

From the formula we can see density 0f the unit cell is inversely propertional to the cube of an edge lenght of the cubic crystal

$d\propto \frac{1}{a^3}$