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diff --git a/3689/CH7/EX7.3/7_3.sce b/3689/CH7/EX7.3/7_3.sce
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+////Variable Declaration
+m = 1.0           //Mass of Methane, kg
+T = 230           //Temeprature of Methane, K
+P = 68.0          //Pressure, bar 
+Tc = 190.56       //Critical Temeprature of Methane
+Pc = 45.99        //Critical Pressure of Methane
+R = 0.08314       //Ideal Gas Constant, L.bar/(mol.K)
+M = 16.04         //Molecular wt of Methane
+
+//Calcualtions
+Tr = T/Tc
+Pr = P/Pc
+z = 0.63          //Methane compressibility factor
+n = m*1e3/M
+V = z*n*R*T/P
+Vig = n*R*T/P
+DV = (V - Vig)/V
+
+//Results
+printf("\n V-Videal %4.2f L",V-Vig)
+
+printf("\n Percentage error %5.2f",DV*100)
+