Consider a binary system of water vapor (1) in air (2) initially at room temperature and pressure (such as the air in this room). You desire to compress the gas to 100 bar and then cool it to 210 °C without any water condensing. Calculate the maximum mole fraction of water that can be in the air. Use the virial equation of state for the vapor phase. At 210°C, you have data for the second virial coeffi cients as follows:

where,

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B11 = - 1500 cm mol B12 = -70 cm mol and, B22 = -20 cm mol