A flue gas leaving a furnace at 500C, and containing 7% CO2, 0.1% CO, 4.3% O2, 14% H2O and 74.6% N2 in mole percent, is used to heat the dry air, supplied to the furnace, in a heat exchanger. The dry air enters the exchanger at 20C and 1 atm pressure and the flue gas leaves the heat exchanger at 200C and 1 atm pressure with a flow rate of 10 m3 /min. Calculate the exit temperature of the heated air (Assume that there is no heat loss to the environment.) Cp air@20 C= 29.04 kJ /mol C and heated air Cp= 32.86 kJ /mol C