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+//Example 7.7

+clear;

+clc;

+

+//Given

+R=0.08205;//gas constant in atm dm^3 K^-1 mol^-1

+R1=8.314;//gas constant in J K^-1 mol^-1

+T=293;//temperature in K

+w1=100;//weight of ethanol taken in g

+w2=100;//weight of methanol taken in g

+p1=44.5;//vapour preaaure of pure ethanol in mm Hg

+p2=88.7;//vapour preaaure of pure methanol in mm Hg

+

+//To determine the vapour pressure of solution,partial vapour pressures and vapour phase composition

+n1=100/46;//moles of ethanol

+n2=100/32;//moles of methanol

+x1=n1/(n1+n2);//mole fraction of ethanol

+x2=n2/(n1+n2);//mole fraction of methanol

+P1=p1*x1;//partial pressure of ethanol in mm Hg

+P2=p2*x2;//partial pressure of methanol in mm Hg

+P=P1+P2;//vapour pressure of the solution in mm Hg

+y1=P1/P;//mole fraction of ethanol in the vapour phase

+y2=1-y1;//mole fraction of methanol in the vapour phase

+mprintf('(i) Vapour pressure of the solution = %f',P);

+mprintf('\n (ii) Partial vapour pressure of ethanol is %f mm Hg and that of methanol is %f mm Hg',P1,P2);

+mprintf('\n (iii) mole fraction of ethanol in vapour phase is %f and that of methanol is %f',y1,y2);