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clear
//
//
//
//Variable declaration
r=1.278*10^-8; //atomic radius(cm)
M=63.54; //molecular weight(g/mol)
N=6.02*10^23; //avagadro number
n=4; //number of atoms
//Calculations
a=4*r/sqrt(2); //lattice constant(cm)
rho=n*M*10^3/(N*a^3); //density(kg/m^3)
//Result
printf("\n density of copper is %0.0f kg/m^3",rho)
printf("\n answer in the book is wrong")
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