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clc//
//
//
//Variable declaration
r=0.1249*10^-9; //radius(m)
pf=0.68; //packing factor
//Calculation
a=4*r/sqrt(3); //lattice constant(m)
v=a^3; //volume of unit cell(m^3)
Fv=(1-pf)*v; //free volume per unit cell(m^3)
//Result
printf("\n free volume per unit cell is %0.4f *10^-30 m^3",Fv*10^30)
printf("\n answer varies due to rounding off errors")
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