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//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)
//Result
printf('Density of iron =%0.3fkg/m**-3",rho)
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