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// Scilab Code Ex6.13 : Distance between nearest neighbours of NaCl: Page-138 (2010)
M = 23+35.5; // Molecular weight of NaCl, kg per k-mole
d = 2.18e+03; // Density of rock salt, kg per metre cube
n = 4; // No. of atoms per unit cell for an fcc lattice of NaCl crystal
N = 6.023D+26; // Avogadro's No., atoms/k-mol
// Volume of the unit cell is given by
// a^3 = M*n/(N*d)
// Solving for a
a = (n*M/(d*N))^(1/3); // Lattice constant of unit cell of NaCl
printf("\nThe distance between nearest neighbours of NaCl structure = %5.3e", a/2);
// Result
// The distance between nearest neighbours of NaCl structure = 2.814e-010
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