I need help with the full answer to this practice problem

(2) Consider a tabe furnace with a diameter of 0.30m, as shown on text book page 218 . A natural gas flowing at a rate of 0.0147kg/s (consi dered to be methane) - air mixture at an equivalence ratio of 0.9 is burned in a rapid mixing burner leading to a hot gas mixture temperature of 2350K at the inlet of the furnace, and heat is transferred from the hot prochucts to the w all with a constant wall temperature of 600K ), leading to a hot gas mixture exit temperature of 1700K. Assume that. the combustion process at the burner does not form any ritic oxide NO but the post flame gases do. Futther asume that the additional constraints and simplifications regarding the pressure, flow, Wall heat tranfer and chemical kinetics given in the text book on page 218 apply. (2A) Find the length of the furnace. (2B) Find the NO mole fraction at the exit considering the forward and the reverse Zeldovich kinetics