Đốt cháy amin đơn chức no A bằng oxi vừa đủ . biết dx/N2 = 12,875

A: C_nH_2n+3N

\(C_{n}H_{2n+3}N\rightarrow nCO_{2}+\frac{2n+3}{2}H_{2}O+\frac{1}{2}N_{2}\)\(1 mol\rightarrow \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, n \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \frac{2n+3}{2}\)

 \(\bar{M}_{X}=12,875.2=\frac{44.n+9(2n+3)+14}{n+\frac{2n+3}{2}+0,5}\)  

\(\Rightarrow n=1:CH_{3}NH_{2}\)