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diff --git a/1808/CH2/EX2.19/Chapter2_Example19.sce b/1808/CH2/EX2.19/Chapter2_Example19.sce
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+clc
+clear
+//INPUT DATA
+//CH4 + 2 O2 = CO2+2 H2O ;//Chemical equation
+hfco2=-393.52;//enthalpy of CO2 in MJ/kmol of CH4
+hfh2o=-241.83;//enthalpy of H2O in MJ/kmol of CH4
+hfch4=-77.87;//enthalpy of CH4 in MJ/kmol of CH4
+hfo2=0;//enthalpy of O2 in MJ/kmol of CH4
+
+//CALCULATIONS
+
+Qp=hfco2+2*hfh2o-(hfch4+2*hfo2);//Lower heating value in MJ/kmol
+Qp1=-Qp/(21*1-1*4);//Lower heating value in MJ/kg
+dU=Qp1;//lower heating values
+
+//OUTPUT
+printf('np=nr \n')
+printf('Lower heating values are \n Qp %3.1f MJ/kg of CH4 \n du  %3.1f MJ/kg of CH4 \n Qp1=dU \n ',Qp1,dU)
+
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