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Gas with greatest molecular weight

  1. Jun 7, 2004 #1
    What room-temperature gas has the greatest molecular weight?
     
  2. jcsd
  3. Jun 8, 2004 #2

    Gokul43201

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    Atomic weight of Rn is 222. That's right up there with the giants.

    I think the record is held by one of the heavy-metal hexa halides. The halide ions provide a nice repulsive shield.
     
  4. Jun 8, 2004 #3

    Gokul43201

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    Could be WF6 (tungsten hexafluoride) at 298 g/mol.
     
  5. Jun 12, 2004 #4
    Since we're talking metal fluorides, PtF6 = 309 g/mol
     
  6. Jun 13, 2004 #5

    Gokul43201

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    But it's a solid at room temp. In fact it is liquid only from 63C to 69C, a pretty small range, wot ?
     
  7. Jun 13, 2004 #6
    yeah, i guess 70C would be a pretty hot room
    well, if we want to stretch it a little UF6 and PuF6 are dern heavy and gases right above room temp, if i'm not mistaken (again) their boiling points are in the 30s or 40s.
     
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