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diff --git a/858/CH2/EX2.30/example_30.sce b/858/CH2/EX2.30/example_30.sce
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+++ b/858/CH2/EX2.30/example_30.sce
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+clc
+clear 
+printf("example 2.30 page number 83\n\n")
+
+//to find the mixture composition
+
+vapor_pressure=8    //in kPa
+pressure=100       //in kPa
+
+//part 1
+volume=1     //in m3
+volume_ethanol=volume*(vapor_pressure/pressure);
+volume_air=1-volume_ethanol;
+printf("volumetric composition:- \nair composition = %f\n ethanol compostion = %f",volume_air*100,volume_ethanol*100)
+
+//part 2
+molar_mass_ethanol=46;
+molar_mass_air=28.9;
+mass_ethanol=0.08*molar_mass_ethanol;    //in kg
+mass_air=0.92*molar_mass_air;     //in kg
+fraction_ethanol=(mass_ethanol*100)/(mass_air+mass_ethanol);
+fraction_air=(mass_air*100)/(mass_air+mass_ethanol);
+printf("\n\ncomposition by weight:-\nAir = %f Ethanol vapor = %f",fraction_air,fraction_ethanol)
+
+//part 3
+mixture_volume=22.3*(101.3/100)*(299/273);   //in m3
+weight_ethanol=mass_ethanol/mixture_volume;
+printf("\n\nweight of ethanol/cubic meter = %f Kg",weight_ethanol)
+
+//part 4
+w_ethanol=mass_ethanol/mass_air;
+printf("\n\nweight of ethanol/kg vapor free air = %f Kg",w_ethanol)
+
+//part 5
+moles_ethanol=0.08/0.92;
+printf("\n\nkmol of ethanol per kmol of vapor free air = %f",moles_ethanol)