Cho 100 ml dd amino axit X nồng độ 0,2M tác dụng v...

B

- Hướng dẫn giải

\(\left.\begin{matrix} n_{X}=0,02mol\\n_{NaOH}=0,02mol \end{matrix}\right\}\rightarrow Y\overset{HCl}{\rightarrow}\)
\(n_{HCl}=0,06mol\)
n_NaOH = n_X  \(\Rightarrow\) Có 1 ( COOH)
\(R(NH_{2})_{x}COOH:0,02\)
\(NaOH:0,02\)
\(HCl:0,06mol\)
\(OH^{-}+H^{+}\rightarrow H_{2}O\)
\(0,02\rightarrow 0,02\hspace{10}0,02\)
\(\Rightarrow 0,02x=0,06-0,02=0,04\)
\(\Rightarrow x=2\)
\(0,02(R+32+45)+0,02.40+0,06.36,5-0,02.18=4,71(g)\)
\(\Rightarrow R=27(C_{2}H_{3})\)
\(C_{2}H_{3}(NH_{2})_{2}COOH\)