â€œDry airâ€ is defined as air with no water vapor, and the molecular weight of air,...

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Chemistry

â€œDry airâ€ is defined as air with no water vapor, and themolecular weight of air, Mair = 28.97 kg/kmol, is for dry air (zerohumidity). â€œWet airâ€ is typically defined as air with 100%humidity.
(a) Calculate the mol fraction of water vapor in wet air at STPconditions. Give your answer in units of PPM to three significantdigits.
(b) Compare the molecular weight of dry air and wet air at STPconditions. Which air is heavier? Explain. Comment about how humidair feels compared to dry air. In particular, in the summer timemost people say that high-humidity air feels â€œthickerâ€ or â€œheavierâ€than low-humidity air at the same temperature. Does this feelingagree with your calculations?

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3.8 Ratings (623 Votes)

a Dry air has a molar mass of 0029 kg It is denser than water vapour which has a molar mass of 0018 kg Therefore humid air is lighter than dry air If the total atmospheric pressure is P and the water vapour pressure is p the partial pressure of the dry air component is See Answer

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â€œDry airâ€ is defined as air with no water vapor, and the molecular weight of air,...