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+clc;clear;
+//Example 15.2
+
+//given data
+P=100;
+
+//from Table A-1
+Mair=29;
+MC=12;
+MH=2;
+
+//calculations
+//Chemical reaction
+//C2H6 + 1.2at(1O2 + 3.76) =2CO2 + 3H2O + 0.2athO2 + (1.2*3.76)athN2
+//ath is the stoichiometric coefficient for air
+//Oxygen balance gives
+// 1.2ath = 2 + 1.5 + 0.2ath
+ath=(2+1.5)/(1.2-0.2);
+AF=(1.2*ath)*4.76*Mair/(2*MC+3*MH);
+disp(AF,'air-fuel ratio of combustion process in kg air/kg fuel');
+//C2H6 + 4.2(O2 + 3.76N2)  = 2CO2 + 3H2O + 0.7O2 + 15.79N2;
+Nprod=2+3+0.7+15.79;
+//for dew point water vapour condenses
+Nv=3;
+Pv=Nv/Nprod*P;
+//at this Pv
+Tdp=52.3;
+disp(Tdp,'the dew-point in C')