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+// Scilab Code Ex6.1 : Lattice parameter of NaCl crystal : Page-134 (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("\nLattice parameter for the NaCl crystal = %4.2f angstrom", a/1e-010);

+

+// Result 

+// Lattice parameter for the NaCl crystal = 5.63 angstrom 
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