Bảo toàn C; $n_{\text{muối}}= n_X=0,1 mol$
$\Rightarrow M_{\text{muối}}= \dfrac{22,3}{0,1}=223$
Muối có dạng $RNH_2(COOK)_x$
$\Rightarrow R+16+(44+39)x=223$
$\Leftrightarrow R+83x=207$
$\Leftrightarrow R=41(C_3H_5), x=2$
Vậy amino axit là axit glutamic.
CTCT: $HOOC-CH(NH_2)-CH_2-CH_2-COOH$