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//Example number 2.8, Page number 34
clc;clear;
close;
// Variable declaration
N=6.023*10**23; // Avagadro Number
Mw=23+35.5; // molecular weight of NaCl
rho=2.18; // density(gm/cm**3)
// Calculation
M=Mw/N; // mass of 1 molecule(gm)
Nv=rho/M; // number of molecules per unit volume(mole/cm**3)
Na=2*Nv; // number of atoms
a=(1/Na)**(1/3)*10**8; // distance between atoms(angstrom)
// Result
printf( "distance between atoms is %.2f Angstrom",a)
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