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diff --git a/599/CH5/EX5.3/example5_3.sce b/599/CH5/EX5.3/example5_3.sce
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+
+clear;
+clc;
+printf("\t Example 5.3\n");
+//part(i)
+pt=800;                    //total pressure in mmHg
+pa=190;                    //vapour pressure of acetone at 25 degree 
+ys_bar=pa*(58/28)/(pt-pa)   //
+//percentage saturation = y_bar/ys_bar *100
+s=80;                      //percent saturation
+y_bar=ys_bar*s/100;        //absolute humidity
+printf("\n the absolute humidity is \t :%f kg acetone/kmol N2 ",y_bar);
+
+//part(ii)
+//y_bar=pa*(58/28)/(pt-pa) 
+pa1=pt*y_bar*(28/58)/(1+(y_bar*(28/58)));
+printf("\n the partial pressure of acetone is:%f mmHg",pa1);
+
+//part(iii)
+y=pa1/(pt-pa1);              //absolute molal humidity
+printf("\n absolute molal humidity \t:%f kmol acetone/kmol N2",y);
+
+//part(iv)
+//volume of .249kmol acetone vapour at NTP =.249*22.14
+//p1v1/T1 =p2v2/T2
+p2=800;                    //final pressure of acetone and nitrogen at 25 degree
+p1=760;                    //initial pressure of acetone and nitrogen at 25 degree
+T2=298;                    //final temperature of acetone and nitrogenat 25 degree
+T1=273;                   //initial temperature of acetone and nitrogen at 25 degree
+vA1=5.581;                    //initial volume of acetone at 25 degree
+vN1=22.414;                   //initial volume of nitrogen at 25 degree 
+vA2=T2*vA1*p1/(T1*p2);        //final volume of acetone at 25 degree
+vN2=T2*vN1*p1/(T1*p2);        //final volume of nitrogen at 25 degree
+vtotal=vA2+vN2;            //total volume of the mixture
+vper=vA2*100/vtotal;           //percentage volume of acetone
+printf("\n the percentage volume of acetone is :%f m^3",vper);
+//end
+\ No newline at end of file