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+//Example 5.5

+clear;

+clc;

+

+//Given

+n=1;//moles of gas

+P1=10.1;//initial pressure in 10^5 N m^-2

+P2=1.01;//final pressure in 10^5 N m^-2

+R=8.314;//gas constant in J K^-1 mol^-1

+T=300//temperature in K

+

+//To determine delE,delH,delA;delG and delS

+w=0;//since the gas expands against zero pressure

+delG=n*R*T*log(P2/P1);//gibbs free energy in J

+delE=0;//isothermal expansion of ideal gas

+q=delE-w;//by 1st Law of thermodynamics

+delH=0;//delH=delE+del(n*R*T) and both are 0

+delA=n*R*T*log(P2/P1);//Helmoltz free energy in J

+delS=R*log(P2/P1);//entropy change in J K^-1

+delSsurr=0;//entropy of the surrounding

+delSuniv=delS+delSsurr;//entropy of the universe in J K^-1

+mprintf('(i) delE = %f J mol^-1 since it is isothermal expansion of an ideal gas',delE);

+mprintf('\n (ii) q = %f J mol^-1',q);

+mprintf('\n (iii) delH = %f J mol^-1',delH);

+mprintf('\n (iv) delA = %f J mol^-1',delA);

+mprintf('\n (v) delG = %f J mol^-1',delG);

+mprintf('\n (vi) delS of system = %f J K^-1 mol^-1',delS);

+mprintf('\n (vii) delS of universe = %f J K^-1 mol^-1',delSuniv);

+//end
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