1 files changed, 33 insertions, 0 deletions
diff --git a/172/CH16/EX16.2/ex2.sce b/172/CH16/EX16.2/ex2.sce
new file mode 100755
index 000000000..bd10a909d
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+++ b/172/CH16/EX16.2/ex2.sce
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+//ques2
+//to determine change in gibbs free energy
+clear
+clc
+//1-H2
+//2-O2
+//3-H2O
+
+//at T=298 K
+T1=298;//K
+Hf1=0;//Enthalpy of formation of H2 at 298 K
+Hf2=0;//Enthalpy of formation of O2 at 298 K
+Hf3=-241.826;//enthalpy of formation of H2O at 298 K in kJ
+dH=2*Hf1+Hf2-2*Hf3;//Change in enthalpy in kJ
+Sf1=130.678;//Entropy of H2 at 298 K n J/K
+Sf2=205.148;//Entropy of O2 at 298 K in J/K
+Sf3=188.834;//entropy of H2O at 298 K in J/K
+dS=2*Sf1+Sf2-2*Sf3;//Change in entropy in J/K
+dG1=dH-T1*dS/1000;//change n gibbs free energy in kJ
+printf(' Change in gibbs free energy at %.0f K = %.3f kJ \n' ,T1,dG1);
+
+//at T=2000 K
+T2=2000;//K
+Hf1=52.942-0;//Enthalpy of formation of H2 at 2000 K
+Hf2=59.176-0;//Enthalpy of formation of O2 at 2000 K
+Hf3=-241.826+72.788;//enthalpy of formation of H2O at 2000 K in kJ
+dH=2*Hf1+Hf2-2*Hf3;//Change in enthalpy in kJ
+Sf1=188.419;//Entropy of H2 at 2000 K n J/K
+Sf2=268.748;//Entropy of O2 at 2000 K in J/K
+Sf3=264.769;//entropy of H2O at 2000 K in J/K
+dS=2*Sf1+Sf2-2*Sf3;//Change in entropy in J/K
+dG2=dH-T2*dS/1000;//change n gibbs free energy in kJ
+printf('  Change in gibbs free energy at %.0f K = %.3f kJ ' ,T2,dG2);
+\ No newline at end of file