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diff --git a/1694/CH1/EX1.22/EX1_22.sce b/1694/CH1/EX1.22/EX1_22.sce
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+clear;
+clc;
+printf("\nEx1.22\n");
+//page no.-33
+//given
+M=58.8;...........//molecular wt. of NaCl
+N=6.023*10^23;....//avagadro no. in gm/mol
+mo=2.18;..........//mass of unit volume of NaCl
+
+m=M/N;..........//mass of NaCl molecule in gm
+
+no=mo/m;.........//no. of molecules per unit volume in mole/cm^3
+//as NaCl is diatomic
+
+n=2*no...........//no. of atoms per unit volume of NaCl in atoms/cm^3
+//as volume of unit cube is n^3*a=1
+
+a=(1/n)^(1/3).....//distance between adjacent atoms in NaCl in cm
+
+printf("\ndistance between two adjacent atoms is 2.81 angstrom\n");