Questions about dew point temperature
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7. For a pyrolysis gas with an average relative molecular mass of 25, its dew point is -60°C. Air with a dew point of -60°C (average relative molecular mass of 29) contains 7 mg/kg of water; therefore, the water content in this pyrolysis gas is approximately ( ) mg/kg. A.8 B.10 C.13 D.15: Is it calculation or guessing? Is there a relationship between dew point and molecular mass?
The dew point is understood as the condition in which the partial pressure of the gas phase at -60 degrees is equal to the saturated vapor pressure; the total pressure of the gases is the same, but their compositions differ, which is why the total volumes of the two gases are different. 7*29/25=8.12
My understanding is that at the same temperature, the masses of the two mixtures are equal; that is: (7*29) + 29 = 25x + 25