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// Scilab Code Ex 1.5 : Page-18 (2006)
clc; clear;5
M_Na = 23; // Atomic weight of Na, gram per mole
M_Cl = 35.5; // Atomic weight of Cl, gram per mole
d = 2.18e+06; // Density of Nacl salt, g per metre cube
n = 4; // No. of atoms per unit cell for an fcc lattice of NaCl crystal
N = 6.023D+23; // Avogadro's No.
// Volume of the unit cell is given by
// a^3 = M*n/(N*d)
// Solving for a
a = (n*(M_Na + M_Cl)/(d*N))^(1/3); // Lattice constant of unit cell of NaCl
printf("\nLattice constant for the NaCl crystal = %4.2f angstorm", a/1e-010);
// Result
// Lattice constant for the NaCl crystal = 5.63 angsotrm
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