Question: A gas mixture contains 10.0 mole% H 2 O (v) and 90.0 mole% N 2 . The gas temperature and absolute pressure at the start

A gas mixture contains 10.0 mole% H₂O (v) and 90.0 mole% N₂. The gas temperature and absolute pressure at the start of each of the three parts of this problem are 50°C and 500 mm Hg. Ideal gas behavior may be assumed in every part of this problem.

(a) If some of the gas mixture is put in a cylinder and slowly cooled at constant pressure, at what temperature would the first drop of liquid form?

(b) If a 30.0.-liter flask is filled with some of the gas mixture and sealed and the water vapor in the flask is completely condensed, what volume (cm³) would be occupied by the liquid water?

(c) If the gas mixture is stored in a rigid-walled cylinder and a low-pressure weather front moves in and the barometric (atmospheric) pressure drops, which of the following would change: (i) the gas density, (ii) the absolute pressure of the gas, (iii) the partial pressure of water in the gas, (iv) the gauge pressure of the gas, (v) the mole fraction of water in the gas, (vi) the dew-point temperature of the mixture?

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