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+//example 3.8
+
+clear;
+clc;
+
+disp("i.C(s) + O2(g) -> CO2(g)");
+//Given:
+H1=-393.5;//change in enthalpy [KJ/mol]
+T1=298;//temperature [K]
+n1=0;//change in no. of moles in reaction moving in forward direction
+R=0.008314;//universal gas constant [KJ/K/mol]
+
+//to find the change in internal energy (U) of given reaction
+U1=H1-n1*R*T1;//change in internal energy [KJ]
+printf("The change in internal energy is %f KJ/mol",U1);
+
+disp("ii.C(s) + 0.5O2 -> CO(g)");
+//Given:
+H2=-110.5;//change in enthalpy[KJ/mol]
+T2=298;//temperature[K]
+n2=1-0.5;//change in no. of moles in reaction moving in forward direction
+R=0.008314;//universal gas constant [KJ/K/mol]
+
+//to find the change in internal energy (U) of given reaction
+U2=H2-n2*R*T2;//change in internal energy [KJ]
+printf("The change in internal energy is %f KJ/mol",U2);
+