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+//Example 4.14
+clear;
+clc;
+
+//Given
+R=8.314;// gas constant in J K^-1 mol^-1
+T=298;//temperature in K
+r=2.5;//rato of final volume to initial volume
+n=2;//moles of gas
+
+//To determine entropy change
+delSgas=R*n*log(r);
+qrev=n*R*T*log(r);
+delSsurr=-qrev/T;//entropy of the surrounding
+delSt=delSgas+delSsurr;//total entropy change in J K^-1
+mprintf('(a) delSgas = %f J K^-1 \n delSsurr = %f J K^-1 \n delStotal = %f J K^-1',delSgas,delSsurr,delSt);
+delSgas=R*n*log(r);
+qirr=qrev-800;
+delSsur=-qirr/T;//entropy of the surrounding
+delSto=delSgas+delSsur;//total entropy change in J K^-1
+mprintf('\n (b) delSgas = %f J K^-1 \n delSsurr = %f J K^-1 \n delStotal = %f J K^-1',delSgas,delSsur,delSto);
+mprintf('\n (c) delSgas = %f J K^-1 \n delSsurr = 0 J K^-1 \n delStotal = %f J K^-1',delSgas,delSgas);
+//end
+\ No newline at end of file