What mass of fluorine gas generates a pressure of #375*"Torr"# when confined to a #5.12*L# volume at #298.9*K#?
Now fluorine gas,
Note that most elemental gases are DIATOMIC: dioxygen, dinitrogen, difluorine, dichlorine etc. The exceptions to this rule are the Noble Gases, which do not normally form compounds, but do habitually occur in gas problems on exams. This simply must be known.