N-butane (C4H10) is burned with 80 percent theoretical air, and the products of combustion, an equilibrium mixture containing only O2, CO, CO2, H2, H2O, N2, NO, and NO2, exit from a combustion chamber at 2000 K, 0.2 MPa. Determine the equilibrium composition at this state. Assuming the reactants are premixed and enter the combustion chamber at 298 K, 0.2MPa, determine the heat transfer to or from the combustion chamber in kJ per kmol of nbutane. (Hint: the concentrations of O2, NO, and NO2 will be much lower than the other concentrations).