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+// Y.V.C.Rao ,1997.Chemical Engineering Thermodynamics.Universities Press,Hyderabad,India.

+

+//Chapter-8,Example 2,Page 275

+//Title: Enthalpy and entropy departure

+//================================================================================================================

+clear 

+clc

+

+//INPUT

+T=427.85;//temperature of n-octane vapour in K

+P=0.215;//pressure of n-octane vapour in MPa

+a=3.789;//van der Waals constant in Pa (m^3/mol)^2

+b=2.37*10^-4;//van der Waals constant in m^3/mol

+v=15.675*10^-3;//volume occupied by n-octane vapour taken from Example (3.8) in m^3/mol

+R=8.314;//universal gas constant in J/molK

+

+//CALCULATION

+//n-octane obeys the van der Waals equation of state

+dep_h=(P*10^6*v)-(R*T)-(a/v);//calculation of the enthalpy departure using Example(8.1) in J/mol

+dep_s=R*log ((P*10^6*(v-b))/(R*T));//calculation of the entropy departure using Example(8.1) in J/molK

+

+//OUTPUT

+mprintf("\n The enthalpy departure for n-octane vapour = %0.2f J/mol\n",dep_h);

+mprintf("\n The entropy departure for n-octane vapour = %0.4f J/mol K\n",dep_s);

+

+//===============================================END OF PROGRAM===================================================