clc//
//
//

//Variable declaration
a=0.27*10^-9;     //spacing(m)
c=0.494*10^-9;
n=6;    //number of atoms
M=65.37;    //atomic weight
N=6.023*10^26;    //avagadro number

//Calculation
V=3*sqrt(3)*a^2*c/2;     //volume of unit cell(m^3)
rho=n*M/(N*V);     //density of zinc(kg/m^3)

//Result
printf("\n volume of unit cell is %0.3f *10^-29 m^3",V*10^29)
printf("\n density of zinc is %0.0f kg/m^3",rho)
printf("\n answer varies due to rounding off errors")