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diff --git a/3689/CH9/EX9.3/9_3.sce b/3689/CH9/EX9.3/9_3.sce
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+////Variable Declaration
+nb = 5.00      //Number of moles of Benzene, mol
+nt = 3.25      //Number of moles of Toluene, mol
+T = 298.15     //Temperature, K
+R = 8.314      //Ideal Gas Constant, J/(mol.K)
+P0b = 96.4     //Vapor pressure of Benzene, torr
+P0t = 28.9     //Vapor pressure of Toluene, torr
+
+//Calculations
+n = nb + nt
+xb = nb/n
+xt = 1. - xb
+P = xb*P0b + xt*P0t
+y = (P0b*P - P0t*P0b)/(P*(P0b-P0t))
+yt = 1. -y
+
+//Results
+printf("\n Total pressure of the vapor is %4.1f torr",P)
+
+printf("\n Benzene fraction in vapor is %4.3f ",y)
+
+printf("\n Toulene fraction in vapor is %4.3f ",yt)
+