[Kuahji]

The question is, "What is the density (in grams per liter) of a gas mixture that contains 27.0% F2 & 73.0% He by volume at 714 mm Hg & 27.5 C?"

The first thing I was to to convert the mm Hg into atm & got .939 atm & then I convert the degrees in Celsius to Kelvin & got 300.6 K.  But this is where I seem to be stuck.  I have two variables.  I don't know the volume & I don't know the number of moles.  How can I solve the problem?

[Borek]

While it can be done using more general approach, start assuming you have exactly 1L of the mixture.

[AWK]

pM=dRT
M=0.27x38 + 0.73x4

[Kuahji]

pM=dRT
M=0.27x38 + 0.73x4

Ok thanks, this was a big help.  I tried this the first time around, but couldn't figure out how to cancel the moles, clearly though that is a big M & not a little m, which would make all the difference.  Thanks  .