Answer
See the answer below.
Work Step by Step
Since, under the same T and P, $V\propto n$, we can predict the stoichiometry to be:
$1.0\ X+ n O_2\rightarrow 2.0\ CO_2+3.5\ H_2O+0.5\ N_2$
Therefore, its empirical formula is:
$C_4H_7N$
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