At 04:10 PM 1/27/2003 -0800, Randall Clague wrote:
That's odd. 1.9 was only a BOTE, but I was expecting better accuracy than 5%. I used:N atomic weight: 14 O atomic weight: 16 H2 molecular weight: 2 ICAO sea level density of air: 1.225 kg/m^3 liters per mole at STP: 22.4 to get air atomic weight: 14.4 H2 molar weight: 3.8 grams then realized I use atomic weights for N and O and molecular weight for H2. Correction yields 1.9 g/mol. Oh bother. 14.4 is 20% N 80% O. With 15.6 I get...2.06 g/mol. Still a 3% error. What am I doing wrong?
At a glance, you left out the contributions of Ar, CO2, and water vapor. That and the fact that you rounded off the molar weights of O2 and N2 should be enough to make up your 3% error.
-p
Mars or Bust!
www.marssociety.com
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