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diff --git a/632/CH12/EX12.18/example12_18.sce b/632/CH12/EX12.18/example12_18.sce
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+//clc()
+Nn2 = 1;//kmol/s ( basis - feed conisting of 1 kmol of N2  and 3 kmol of H2 )
+Nh2 = 3;//kmol/s
+//let x be the fraction converted 
+T1 = 700;//K
+Hr1 = -94.2;//kJ/mol
+//heat liberated = Hr1 * x
+//Product consists of 2x kmol NH3, (1-x)kmol N2, and 3(1-x)kmol Hydrogen
+T2 = 800;//K
+Hn2 = 0.03;//kJ/molK
+Hh2 = 0.0289;//kJ/molK
+Hnh3 = 0.0492;//kJ/molK
+//H2 = (1-x)*0.03*10^3 * 100 + 3*(1-x)*0.0289*1000*100 + 2*x*0.0492*1000*100
+//H2 = 11.67*1000 - 1.83*10^3*x kJ
+//reaction is adiabatic, hence, H1 = H2
+//solving this we get,
+x = 0.1215;
+Convmax = x * 100;
+disp("%",Convmax,"The maximum conversion for nitrogen should be ")
+\ No newline at end of file