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

+

+//Chapter-8,Example 5,Page 281

+//Title: Enthalpy and entropy departure using the generalized Redlich-Kwong equation of state

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

+clear 

+clc

+

+//INPUT

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

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

+a=4.426;//Redlich-Kwong constant taken from Example(3.9) in (m^6 Pa mol^-2)

+b=164.3*10^-6;//Redlich-Kwong constant taken from Example(3.9) in m^3/mol

+Z=0.9308;//compressibility factor taken from Example(3.9) (no unit)

+B=9.9306*10^-3;//value of B, used in the Cardan's method in Example (3.9)

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

+

+//CALCULATION

+dep_h=(R*T*(Z-1))-(((3*a)/(2*b))*log ((Z+B)/Z));//calculation of the enthalpy departure using Eq.(8.39) in J/mol

+dep_s=(R*log(Z-B))-((a/(2*b*T))*log((Z+B)/Z));//calculation of the entropy departure using Eq.(8.40) in J/molK

+

+//OUTPUT

+mprintf("\n The enthalpy departure for n-octane vapour using the generalized Redlich-Kwong equation of state = %0.2f J/mol\n",dep_h);

+mprintf("\n The entropy departure for n-octane vapour using the generalized Redlich-Kwong equation of state = %0.4f J/mol K\n",dep_s);

+

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