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+
+// Given:-
+// Complete combustion of liquid octane with O2 is described by
+// C8H18(l) + 12.5O2   -----   8CO2 + 9H2O
+
+// Part(a)
+Rbar = 8.314                                                                    // universal gas constant in SI units
+Tnot = 298.15                                                                   // in kelvin
+// From table A-25
+gbarC8H18 = 6610.0
+gbarO2 = 0
+gbarCO2 = -394380
+gbarH2O = -228590
+yO2 = 0.2035
+yCO2 = 0.0003
+yH2O = 0.0312
+M = 114.22                                                                      // molecular weight of liquid octane
+
+// Calculations
+ech = ((gbarC8H18 + 12.5*gbarO2 -8*gbarCO2 -9*gbarH2O) + Rbar*Tnot*log(yO2**12.5/(yCO2**8*yH2O**9    )))/M
+// Result
+printf( ' Part(a) the chemical exergy obtained on a unit mass basis is:  %.2f kJ/K',ech)
+
+// Part(b)
+// With data from Table A-25 and Model II of Table A-26
+gbarH2O = -237180.0
+ebarCO2 = 19870.0
+ebarH2O = 900.0
+ebarO2 = 3970.0
+
+// Calculation
+ech = ((gbarC8H18 + 12.5*gbarO2 -8*gbarCO2 - 9*gbarH2O) + 8*ebarCO2 + 9*ebarH2O - 12.5*ebarO2)/M
+// Result
+printf( ' Part(b) chemical exergy on a unit mass basis is: %.3f kJ/K',ech)