What room-temperature gas has the greatest molecular weight?
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
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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