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diff --git a/1943/CH4/EX4.2/Ex4_2.sce b/1943/CH4/EX4.2/Ex4_2.sce
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+++ b/1943/CH4/EX4.2/Ex4_2.sce
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+
+clc 
+clear
+//Input data
+CO2=11.5;//Percentage of carbondioxide present in combustion in %
+O2=2.7;//Percentage of oxygen present in the combustion in %
+CO=0.7;//Percentage of carbonmonoxide present in the combuston in %
+
+//Calculations 
+a=85.1/3.76;//Equating moles for nitrogen from the equation 
+x=(CO2+CO)/3;//Equating moles for carbon from the equation 
+b=[a-CO2-(CO/2)-O2]*2;//Equating moles for oxygen from the equation 
+y=a/x;//Moles of oxygen supplied for one mole of propane gas
+z=5;//Theoretically 5 moles of oxygen are required for reacting
+E=[(y-z)/z]*100;//The excess of air supplied in %
+
+//Output
+printf('The percentage excess air used is = %3.1f percentage',E)