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diff --git a/632/CH12/EX12.15/example12_15.sce b/632/CH12/EX12.15/example12_15.sce
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+//clc()
+//CO(g) + H2O(g) = CO2(g) + H2(g)            H298 = -41.190
+T1 = 298;//K
+Pconv = 75;//%
+T2 = 800;//K
+H298 = -41.190;//kJ
+Hco = 30.35;//J/molK
+Hco2 = 45.64;//J/molK
+Hwater = 36;//J/molK
+Hh2 = 29.3;//J/molK
+Nco = 1;//mol
+Nh2o = 1;//mol
+Ncofinal = Nco * (1 - Pconv/100);
+Nwaterf = Ncofinal;
+Nco2final = Nco - Ncofinal;
+Nh2final = Nco2final;
+H2 = (Nco2final * Hco2 + Nh2final * Hh2 + Ncofinal * Hco + Nwaterf * Hwater) * (T2 - T1);
+Hr1 = H298 * (Nco - Ncofinal);
+Hr2 = Hr1 * 1000 + H2;
+mh2 = Nh2final * 2.016 * 10^-3;//kg
+//therfore for 1000k H2,
+Hr = Hr2 * 1000 / (mh2 * 1000);//kJ
+disp("kJ",Hr,"Amount of heat change for 1000kg of hydrogen produced = ")
+\ No newline at end of file