Best Answer

its helium

with a density of 4.003g/cm3

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Uranium Hexaflouride

Molar weight -- Uranium 238.03 g/mol + 6x(Florine 37.99 g/mol) = 465.97 g/mol

At room pressure, it sublimes at 56.5 °C.

PV=nRT

1V=1(0.082057)(273.15+56.5)'K

V=27 liters/mol

465.97 g/mol / 27L/mol = 17.26 g/L

Helium is only 0.1786 g/L

Radon is only 9.73g/L

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Q: What gas has greatest density?

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