A chemical plant uses a tube-within-a-tube counterflow heat exchanger to heat air with the use of steam. During steady state operation, the air flows into the exchanger at a rate of 5,000 kg/h and a temperature of 27C and exits at a temperature 20C higher. The air behaves like an ideal gas and its thermodynamic properties are listed in one of the tables in the textbook. Steam enters the heat exchanger as saturated vapor at a pressure of 10^5 N/m2 and exits with a specific enthalpy of 2,223.86 kJ/kg at the same pressure. There is negligible heat transfer between the heat exchanger and its surroundings and no kinetic and potential energy effects. Calculate (a) The mass flow rate of the steam in kg/h; and (b) The quality of the steam exiting the heat exchanger.