Gas with greatest molecular weight

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The discussion centers on identifying the room-temperature gas with the highest molecular weight. Radon (Rn) has an atomic weight of 222, making it a contender. However, the conversation shifts to heavy-metal hexafluorides, particularly tungsten hexafluoride (WF6) at 298 g/mol and platinum hexafluoride (PtF6) at 309 g/mol, although PtF6 is a solid at room temperature. The focus then moves to uranium hexafluoride (UF6) and plutonium hexafluoride (PuF6), which are gases just above room temperature, with boiling points in the 30s or 40s Celsius. Overall, the discussion highlights the complexities of determining the heaviest room-temperature gas, considering both molecular weight and physical state.
Loren Booda
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What room-temperature gas has the greatest molecular weight?
 
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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.
 
Could be WF6 (tungsten hexafluoride) at 298 g/mol.
 
Since we're talking metal fluorides, PtF6 = 309 g/mol
 
shrumeo said:
Since we're talking metal fluorides, PtF6 = 309 g/mol

But it's a solid at room temp. In fact it is liquid only from 63C to 69C, a pretty small range, wot ?
 
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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