1) 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 1atm pressure and the flue gas leaves the heat exchanger at 200C and 1atm pressure with a flow rate of 10m3/min. Calculate the exit temperature of the heated air (Assume that there is no heat loss to the environment.) Cp air @20C=29.04kJ/molC and heated air Cp=32.86kJ/molC