a) A35ft3 tank containing dry air is cooled from 120F to 70F with 80% relative humidity, and water vapors entering at partial pressure i.e. 0.028atm and vapor pressure of water i.e. 1.56atm at the entrance. Assuming ideal gas and constant volume during the operation. Using the psychrometric chart and relationships, determine the following: i. Enthalpy of dry air in Btu/lbm dryair. ii. Absolute humidity. iii. Wet bulb temperature ( Twet )