$$N_2+O_2\rightarrow N_xO_y$$ Now using POAC[Principle of Atomic conservation], $$\frac5{28}.2=\frac{19.3}{14x+16y}.x\implies \frac yx\approx2.5025\sim2.5\implies y'=5,x'=2\implies N_2O_5$$
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