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+//(13.6)   A mixture of 1 kmol of gaseous methane and 2 kmol of oxygen initially at 25C and 1 atm burns completely in a closed, rigid container. Heat transfer occurs until the products are cooled to 900 K. If the reactants and products each form ideal gas mixtures, determine (a) the amount of heat transfer, in kJ, and (b) the final pressure, in atm.
+
+
+//solution
+
+//variable initialization
+nCH4 = 1                                                                        //moles of methane in kmol
+nO2 = 2                                                                         //moles of oxygen in kmol
+T1 = 25                                                                         //in degree celcius
+p1 = 1                                                                          //in atm
+T2 = 900                                                                        //in kelvin
+Rbar = 8.314                                                                    //universal gas constant
+//The chemical reaction equation for the complete combustion of methane with oxygen is
+//CH4 + 2O2   ---->   CO2 + 2H2O
+
+//part(a)
+//with enthalpy of formation values from table A-25
+hfbarCO2 = -393520
+hfbarH2O = -241820
+hfbarCH4 = -74850
+//with enthalpy values from table A-23
+deltahbarCO2 = 37405-9364
+deltahbarH2O = 31828-9904
+
+Q = ((hfbarCO2 + deltahbarCO2)+2*(hfbarH2O + deltahbarH2O) - hfbarCH4) + 3*Rbar*(T1+273-T2)
+printf('the amount of heat transfer in kJ is:  %f',Q)
+
+//part(b)
+p2 = p1*(T2/(T1+273))                                                           //in atm
+printf('\nthe final pressure in atm is:  %f',p2)
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