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+//Example 17.11//
+
+b=100;//g //doped GaAs
+c=10^9;//ppb Se 
+d=100;//g //given
+a=(d/c)*b
+mprintf("a = %e g Se",a)
+S=78.96;//g/g.atom //atomic mass of selenium
+Se=a/S
+mprintf("\nSe = %e g atom",Se)
+Ga=69.72;//g/mol //atomic mass of gallium
+As=74.92;//g/mol //atomic mass of arsenic
+G=(b-a)/(Ga+As)
+mprintf("\nG = %f mol",G)
+m=(Se/(G+Se))*100
+mprintf("\nm = %e mol percent",m)