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diff --git a/1694/CH1/EX1.9/Ex1_9.sce b/1694/CH1/EX1.9/Ex1_9.sce
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+clear;
+clc;
+printf("\nEx1.9\n");
+//page no.-11
+//given
+rho=2170;.......//density of NaCl in kg/m^3
+m=58.45;.........//molecular wt. of NaCl 
+n=4;...........//molecules per unit cell for F.C.C.
+N=6*10^26;...//avagadro no.
+
+M=(n*m)/N;..........//mass in each unit cell
+//as density=mass/volume, so volume is a^3
+
+a=(M/rho)^(1/3)......//lattice constant in Angstrom
+
+printf("\nlattice constant is 5.64 angstrom\n");