(1) A 0.5-ft^3 balloon filled with nitrogen gas is initally at 75 degrees F and 50 psia. It is now heated at constant pressure to 150 degrees F. What is the new volume in ft^3?
(2) A room with dimensions 10 x 10 x 20 meters is filled with air at 20 degrees C, 101 kPa and relative humidity 0.8. What is the mass of water vapor in the room, in units of kg?