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+//page 72
+clc;funcprot(0);//EXAMPLE 3.12
+// Initialisation of Variables
+r1=0.066;.......//Radius of Mg+2 from Appendix B in nm
+r2=0.132;.......//Radius of O-2 from Appendix B  in nm
+Am1=24.312;.......//Atomic masses of Mg+2 in g/mol
+Am2=16;.......//Atomic masses of O-2 in g/mol
+Na=6.02*10^23;......//Avogadro’s number
+//CALCULATIONS
+a0=2*r1+2*r2;...........//Lattice constant for MgO in nm
+rho=((4*Am1)+(4*16))/((a0*10^-8)*Na);.....//Density of MgO in g/cm^3
+disp(a0*10^-8,"Lattice constant for MgO in cm:")
+disp(rho,"Density of MgO in g/cm^3:")
+//Answer given in the book is wrong
+\ No newline at end of file