Posted by Bobby on Sunday, June 28, 2009 at 8:59pm.
The molar mass of a gas is the mass of a mole. Since the density is 1.41 g/L and the volume of 1 mole at the listed T and P is 27 L; therefore, the mole has a mass of
1.41 g/L x 27 L = about 38. Check me out on this and round to three significant figures. Since a mole of a gas at STP occupies 22.4 L, then 38/22.4 = ?? density at STP (substitute YOUR value for the 38 in the latter). I find approximately 1.7 g/L. Again, round to 3 s.f.
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