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is the mass of pure oxygen gas less than that of the same volume of air at the same temperature/pressure?
I did an experiment in chem class in which i found the mass of a sealed flask with air in it, then replaced the air with oxygen and found the mass of that. The mass of the flask + O2 is less than just the flask. Did i do something wrong?
The typical air composition is: 78% nitrogen, 20.95% oxygen, 0.93% argon, and very small percentage of other gases. At the atmospheric pressure and temperature, air can be very well approximated as the (mixture of) ideal gas/es. Thus one mole of gas always occupies the same volume at the same P and T. The molecular weight of N2 is 28, O2 32, Ar 40. You may calculate the averaged air "molecular" weight, which is less than O2. In another word, O2 density is higher than air, for sure.
When you do experiments, please pay close attention to temperature, composition, wetness, etc.
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