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//Example number 2.4, Page number 32
clc;clear;
close;
// Variable declaration
N=6.02*10**26; // Avagadro Number
rho=7870; // density(kg/m**3)
M=55.85; // atomic weight(amu)
a=2.9*10**-10; // lattice constant(m)
// Calculation
n=a**3*rho*N/M; // number of atoms
// Result
printf( "number of atoms is %d",n)
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