URGENT PLEASE

Ceramic compounds $AB$ and $AC$ both have the zinc blende crystal structure and are soluble

in one another at all concentrations. Determine the concentration in weight percent of AC

that must be added to $AB$ to yield a unit cell edge length of $0\mathrm{.}5304nm.$ The densities of $AB$

and $AC$ are $4\mathrm{.}8\frac{g}{c}{m}^3$ and $4\mathrm{.}2\frac{g}{c}{m}^3,$ respectively. The atomic weights of $A,B,$ and $C$ are

$30,80,$ and $60\frac{g}{m}ol,$ respectively.

a$.45$

b$.38$

c$.26$

d$.32$

e$.21$

f$.15$

g$.41$