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+//ques-18.24
+//Finding vapour pressure of benzene at 300 K
+clc
+Hv=7413;//latent heat of vapourization (in cal/mol)
+T1=273+80; T2=273+27;//temperature (in K)
+P1=760;//mm Hg
+R=1.987;//cal/mol/K
+//On solving, log(P2/P1) = (Hv*(T2-T1))/(2.303*R*T1*T2)
+P2=P1/6.467;
+printf("The required vapour pressure is %.2f mm Hg.",P2);