A gas mixture (16 mol % O, 68 mol% N, 1 mol % CO, 5 mol % CO2, and 10 mol % HO) is cooled from 1100 C to 100 C using a type of heat exchanger called a waste heat boiler. Water is fed to the boiler at 20 C and 1 atm, and exits as saturated steam at 5 atm. a) Calculate the relative molar flowrate of the cooling water to the gas mixture (i.e., nw/ng). b) Why might a waste-heat boiler be used instead of discharging the hot gas stream to the environment?