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//Calculate the Lattice energy of Sodium Chloride
//Example 20.2
clc;
clear;
n=8.4; //Integer between 8 and 12( For the repulsive term in the lattice)
NA=6.022*10^23; //Avogadro's number in mol^-1
mew=1.7476; //Madelung constant for the NaCl crystal lattice
e=1.602*10^-19; //Charge on electron in C
epsilion=8.854*10^-12 //Molar extinction cofficient in C^2 N^-1 m^-2
r=2.81*10^-10; //Sum of radii of Sodium ion and Chlorine ion in m
Vbar=-((NA*mew*e^2)/(4*%pi*epsilion*r))*(1-(1/n)); //Lattice energy in J mol^-1(conversion factor 1J=1N m)
U=-Vbar/1000; //Lattice energy in kJ mol^-1
printf("Lattice energy of Sodium chloride = %.0f kJ mol^-1",U);
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