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+//example 5.29
+
+clear;
+clc;
+
+//Given:
+T2=353.2;//normal boiling point of benzene at 1.01325bar[K]
+T1=298;//temperature [K]
+R=8.314;//Universal gas constant[J/K/mol]
+P2=1.01325;//Vapour pressure of benzene[bar]
+//benzene obey's Trouton's rule
+disp(" from Troutons rule , ");
+disp(" He/Tb=85J/K/mol");
+
+//To find the vapour pressure of benzene at 298K
+He=85*T2;//molar enthalpy of vapourization[J/K/mol]
+x=(T2^-1)-(T1^-1);
+t=-He*x/R;
+P1=P2/exp(t);
+printf("\nThe vapour pressure of benzene at 298K is %f bar",P1);