Answer
$12.6\text{ grams/Liter}$
Work Step by Step
Molar mass of Uranium hexafluoride = 352.02 g/mol
$\text{ Molar mass}=\frac{dRT}{P}$
$352.02=\frac{d*0.08206*333}{\frac{745}{760}}\Rightarrow d=12.6\text{ grams/L}$
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