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diff --git a/926/CH5/EX5.4/Chapter5_Example4.sce b/926/CH5/EX5.4/Chapter5_Example4.sce
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+//Hougen O.A., Watson K.M., Ragatz R.A., 2004. Chemical process principles Part-1: Material and Energy Balances(II Edition). CBS Publishers & Distributors, New Delhi, pp 504
+
+//Chapter-5, Illustration 4, Page 114
+//Title: Calculation of dew point
+//=============================================================================
+clear
+clc
+
+//INPUT
+v1 = 10.1; //Composition by volume of benzene
+P = [750 750 700]; //Various pressurea in mm Hg at which dew point is to be computed
+
+//CALCULATIONS
+P1 = P(1)*v1/100; //Partial pressure of benzene in mm Hg at 25 degree C and 750 mm Hg
+T1 = 20; //Temperature in degree C corresponding to pressure P1 obtained from vapor-pressure data of Benzene Fig. 15 Page 84
+P2 = P(2)*v1/100; //Partial pressure of benzene in mm Hg at 30 degree C and 750 mm Hg
+T2 = 20; //Temperature in degree C corresponding to pressure P2 obtained from vapor-pressure data of Benzene Fig. 15 Page 84
+P3 = P(3)*v1/100; //Partial pressure of benzene in mm Hg at 30 degree C and 700 mm Hg
+T3 = 18.7; //Temperature in degree C corresponding to pressure P3 obtained from vapor-pressure data of Benzene Fig. 15 Page 84
+
+//OUTPUT
+// Console output
+mprintf('\n Dew point of benzene vapor and air mixture at \n (a) 25 degree C and 750 mm Hg = %2.0f degee C ',T1);
+mprintf('\n (b) 30 degree C and 750 mm Hg = %2.0f degree C ',T3);
+mprintf('\n (c) 30 degree C and 700 mm Hg = %3.1f degree C',T3);
+mprintf('\n Above results shows that the dew point does not depend on temperature but vary with the total pressure');
+
+// File output
+fd= mopen('.\Chapter5_Example4_Output.txt','w');
+mfprintf(fd,'\n Dew point of benzene vapor and air mixture at \n (a) 25 degree C and 750 mm Hg = %2.0f degee C ',T1);
+mfprintf(fd,'\n (b) 30 degree C and 750 mm Hg = %2.0f degree C ',T3);
+mfprintf(fd,'\n (c) 30 degree C and 700 mm Hg = %3.1f degree C',T3);
+mfprintf(fd,'\n Above results shows that the dew point does not depend on temperature but vary with the total pressure');
+mclose(fd);
+
+//=========================END OF PROGRAM======================================
diff --git a/926/CH5/EX5.4/Chapter5_Example4_Output.txt b/926/CH5/EX5.4/Chapter5_Example4_Output.txt
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+
+ Dew point of benzene vapor and air mixture at 
+ (a) 25 degree C and 750 mm Hg = 20 degee C 
+ (b) 30 degree C and 750 mm Hg = 19 degree C 
+ (c) 30 degree C and 700 mm Hg = 18.7 degree C
+ Above results shows that the dew point does not depend on temperature but vary with the total pressure
+\ No newline at end of file