Cho 0,76 gam hh X gồm hai amin đơn chức, có số mol bằng nhau, phản ứng hoàn toàn

${R_1}N\,$và ${R_2}N\,\,$+ HCl
Bảo toàn khối lượng: ${m_{muoi}}\, - \,\,{m_{a\min }}\,\, = \,\,{m_{HCl}}\,\,$
→ ${n_{HCl}}\,\, = \,\,{n_{a\min }}\, = \,\,{n_{{R_1}N}}\, + \,\,{n_{{R_2}N}}\, = \,0,02\,\,mol$
→ ${n_{{R_1}N}}\,\, = \,\,{n_{{R_2}N}}\,\, = \,\,0,01\,\,mol$
→ ${M_{a\min }}\,\, = \,{R_1}\,\, + \,\,14\,\, + \,\,{R_2}\,\, + \,14\, = \,\,76\,\, \to \,\,\left\{ \begin{array}{l}
{R_1}:\,\,17\,\,(C{H_5})\\
{R_2}:\,\,31\,({C_2}{H_7})
\end{array} \right.\,\, \to \,\,{m_{{C_2}{H_5}N}} = \,0,31\,g$