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clear
//
//
//
//Variable declaration
n=8 //number of atoms
r=2.351*10**-10 //bond length(angstrom)
A=28.09 //Atomic wt. of NaCl
N=6.02*10**26 //Avagadro number
//Calculation
a=4*r/sqrt(3)
rho=n*A/(N*a**3) //density(kg/m**3)
//Result
printf("\n density is %0.0f kg/m**3",rho)
printf("\n answer varies due to rounding off errors")
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