to improve the combustion efficiency using stack gas, air for combustion is preheated in a combustion air preheater at constant pressure. 100 mole/s of air at 25 oCand 1atm is preheated to 900 oC using stack gas that enters at 1400 oC and 1 atm in a ratio of 1:2 air tostackgas. The stack gas contains 6.5 mole % carbon dioxide, 13.1 mole % water vapor, 73.8mole%nitrogen and 6.6 mole % oxygen . (a) Draw and label a flowchart for this process completely and state your basis. (5Marks)(b) Construct an inlet-outlet enthalphy table for this heating process. Determine the exit temperature of the stack gas using INTEGRATION without using Table B8. State assumptions made. (12Marks)(c) If the exit air temperature is increased, briefly explain what will happen to the exit temperature of the stack gas and why. (3 Marks)