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//Example number 6.12, Page number 6.51
clc;clear;close
// variable declaration
r=0.123 // Atomic radius
n=4
A=55.8 // Atomic wt
a=2*sqrt(2)
N=6.02*10**26 // Avagadro number
// Calculations
rho=(n*A)/((a*r*10**-9)**3*N) // kg/m^3
// Result
printf("Density of iron = %.f kg/m^-3",rho)
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