12.31 A lecture hall shown in

Fig. P12.31 having a volume of

10^6 ft3 contains air at 80°F, 1

atm, and a humidity ratio of

0.01 lb of water vapor per lb of

dry air. Using the appropriate

equations, determine

a. the relative humidity.

b. the dew point

temperature, in °F.

c. the mass of water vapor

contained in the room, in lb.