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diff --git a/1808/CH2/EX2.1/Chapter2_Example1.sce b/1808/CH2/EX2.1/Chapter2_Example1.sce
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+clc
+clear
+//INPUT DATA
+//GASES IN THE ORDER CO2,CO,O2,N2
+p=[16.1,0.9,7.7,75.3];//percentage of gas
+m=[44,28,32,28];//molecular weight of gas
+
+//CALCULATIONS
+x1=p(1)/m(1);//individual moles per 100 kg of CO2 mixture
+x2=p(2)/m(2);//individual moles per 100 kg of CO mixture
+x3=p(3)/m(3);//individual moles per 100 kg of O2 mixture
+x4=p(4)/m(4);//individual moles per 100 kg of N2 mixture
+x=x1+x2+x3+x4;//Total moles per 100 kg mixture
+v1=(x1/x)*100;//percentage of gases on volume basis
+v2=(x2/x)*100;//percentage of gases on volume basis
+v3=(x3/x)*100;//percentage of gases on volume basis
+v4=(x4/x)*100;//percentage of gases on volume basis
+v=v1+v2+v3+v4;//total percentage of gases on volume basis
+
+//OUTPUT
+printf('(i)percentage of gases on volume basis is %3.3f ',v)
+
+