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//Example number 2.5, Page number 33
clc;clear;
close;
// Variable declaration
N=6.02*10**26; // Avagadro Number
M=63.5; // atomic weight(amu)
r=0.1278*10**-9; // atomic radius(m)
n=4;
// Calculation
a=r*sqrt(8); // lattice constant(m)
rho=n*M/(N*a**3); // density(kg/m**3)
// Result
printf( "density is %.2f kg/m**3",rho)
//answer in the book is wrong
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