Answer to Question #316664 in Mechanical Engineering for Jhonny

Question

7. A 6 x 5 x 4 m room has a pressure of 101 kpa and temperature of 30oC (Psat = 5 kpa). If percent

relative humidity is 65%, find the mass of vapor (RV = 0.423 KJ/kgoK).

ANSWER:

A. 0.345 kg B. 1.23 kg C. 3.04 kg D. 2.19 kg

Answer 1

If we rapidly cool the vapor, then the gas will be liquefied and can be weighed. The mass of this condensed vapor is equal to the mass of vapor that fills the flask at the elevated temperature and barometric pressure. the known molar mass of the compound. A result within 20% of the actual value is not unusual.