Answer
See the answer below.
Work Step by Step
Since T and V remain constant, $n\propto P$ so:
Consumed: $0.12\ atm\ Xe$, $(0.72-0.12)-0.36=0.24\ atm\ F_2$
Ratio: $0.24/0.12=2.0$
Empirical formula: $XeF_2$
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