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Old Sep 17th 2012, 12:04 AM   #1
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Join Date: Sep 2012
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Atmospheric Thermodynamics hw problem

My classmates and I have been puzzling over this problem that my prof wrote up for our homework. I keep trying different versions of the ideal gas law to solve it but I feel like there's missing information or something. The problem is as follows:

Find the average molecular weight M and specific gas constant R for some air with a water vapor pressure of 30hPa, a total pressure of 1atm, and temperature of 30*C. Estiate the density of this air and compare with the density of dry air t the same temperature and total pressure. What would the temperature of the dry air have to be to give the same density as the moist air?

(I can definitely figure out the second half on my own, however I can't get to this part without first calculating M and R. Help???)
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