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diff --git a/632/CH10/EX10.18/example10_18.sce b/632/CH10/EX10.18/example10_18.sce
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+//clc()
+m = 100;//mol ( basis reactore exit gas )
+//CH3OH + O2 = HCOOH + H2O
+//CH3OH + O2 / 2 = HCHO + H2O
+Nn2 = 64.49;//mol
+No2 = 13.88;//mol
+Nh2o = 5.31;//mol
+Nch3oh = 11.02;//mol
+Nhcho = 4.08;//mol
+Nhcooh = 1.22;//mol
+//x be the moles of methanol reacted, taking C balance, we get,
+x = Nch3oh + Nhcho + Nhcooh;
+Pconv = Nhcho * 100 / x ;
+disp("%",Pconv,"(a)Percent conversion of formaldehyde = ")
+Nair = Nn2 * 100 / 79;
+R = Nair / x;
+disp(R,"(b)Ratio of air to methanol in the feed = ")
+\ No newline at end of file