\(\begin{gathered} + \,\,\left\{ \begin{gathered} X\xrightarrow{{NaOH}}a\min + muoi \hfill \\ X\,\,co\,CTPT{C_2}{H_8}{O_3}{N_2} \hfill \\ \end{gathered} \right. \Rightarrow \left\{ \begin{gathered} X\,\,la\,\,muoi\,\,amoni \hfill \\ co\,goc\,{\text{ax}}it:\,\,N{O_3};\,\,C{O_3};\,\,HC{O_3} \hfill \\ \end{gathered} \right. \hfill \\ + \,\,4\,\,chat\,\,trong\,\,X\,\,la:\,\,\left\{ \begin{gathered} {C_2}{H_5}N{H_3}N{O_3};\,\,{(C{H_3})_2}N{H_2}N{O_3} \hfill \\ C{H_2}{(N{H_3})_2}C{O_3};\,\,{H_2}NC{H_2}N{H_3}HC{O_3} \hfill \\ \end{gathered} \right. \hfill \\ + \,\,So\,\,do\,phan\,\,ung: \hfill \\ \,\,\,\,\,\,\,\left\{ \begin{gathered} \left\{ \begin{gathered} {C_2}{H_5}N{H_3}N{O_3} \hfill \\ {(C{H_3})_2}N{H_2}N{O_3} \hfill \\ \end{gathered} \right\}:\,\,x\,\,mol \hfill \\ \left\{ \begin{gathered} C{H_2}{(N{H_3})_2}C{O_3} \hfill \\ {H_2}NC{H_2}N{H_3}HC{O_3} \hfill \\ \end{gathered} \right\}:\,\,y\,\,mol \hfill \\ \end{gathered} \right\}\xrightarrow{{NaOH}}\left\{ \begin{gathered} \left\{ \begin{gathered} {C_2}{H_5}N{H_2} \hfill \\ {(C{H_3})_2}NH \hfill \\ \end{gathered} \right\}:\,\,x\,\,mol \hfill \\ C{H_2}{(N{H_2})_2}:\,\,y\,\,mol \hfill \\ \end{gathered} \right\} + \,\,\left\{ \begin{gathered} \underbrace {NaN{O_3}}_{x\,\,mol} \hfill \\ \underbrace {N{a_2}C{O_3}}_{y\,\,mol} \hfill \\ \end{gathered} \right\} \hfill \\ \Rightarrow \left\{ \begin{gathered} x + y = 0,3 \hfill \\ 85x + 106y = 29,28 \hfill \\ \end{gathered} \right. \Rightarrow \left\{ \begin{gathered} x = 0,12 \hfill \\ y = 0,18 \hfill \\ \end{gathered} \right. \Rightarrow \left\{ \begin{gathered} {n_{NaOH}} = x + 2y = 0,48 \hfill \\ {V_{dd\,\,NaOH\,\,0,5M}} = 0,96\,\,lit = \boxed{960\,\,ml} \hfill \\ \end{gathered} \right. \hfill \\ \end{gathered} \)