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//Chapter-22,Example 4,Page 502
clc();
close();
M=58.46 //molecular weight of NaCl
N= 6.023*10^23 //Avogadro number
p=2.167 //density of NaCl
n= 4 //number of molecules per unit cell
a=nthroot((n*M/(p*N)),3)/100 //lenght of the edge
h=1
k=1
l=0
d=a/sqrt((h^2)+(k^2)+(l^2))
printf("the lattice constant is a= %.12f meter",a)
printf("\n the spacing between planes is d = %.10f meter",d)
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