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+//Example 9// Ch 3
+clc;
+clear;
+close;
+// given data
+d = 0.075; //density of solid atomic hydrogen in g/cm^3
+N_A = 6.0224*10^23; //1g of H consists of N_A atoms
+N = N_A*d; // number of atoms/cm^3
+printf("no. of atoms/cm^3 %e",N)
+x = 1/N;//avg volume occupied by one atom in cm^3
+y = (x)^(1/3);//avg seperation between atoms in cm
+printf("avg vokume occupied by one atom %e cm^3",x)
+printf("avg seperation between atoms %e cm",y)