A. 1,61%.
B. 4,17%.
C. 2,08%.
D. 3,21%.
B
\(\frac{E}{2} \Leftrightarrow \left\{ \begin{array}{l}
{C_2}{H_3}NO:x\\
C{H_2}:y\\
{H_2}O:z\\
HCOO{C_2}{H_5}:t
\end{array} \right. \to \left\{ \begin{array}{l}
2\left( {57x + 14y + 18z + 74t} \right) = 249,56\\
0,5x - z = 0,11\\
97x + 14y + 68t = 133,18\\
2,25x + 1,5y + 0,5t = 3,385
\end{array} \right. \to \left\{ \begin{array}{l}
x = 0,42\\
y = 1,26\\
z = 0,1\\
t = 1,1
\end{array} \right.\)
\({\bar C_{X;Y;Z}} < 11 \to {\left( {C{H_2}} \right)_T} > \frac{{1,26 - \left( {0,1.11 - 0,42.2} \right)}}{{1,1}} = 0,9 \to T = C{H_3}COOC{H_3} \to {n_{C{H_2}\left( {X;Y;Z} \right)}} = 0,16\)
\( \to m{x_{tb}} = 4,2 \to \left\{ \begin{array}{l}
X = AlaVal:a\\
Y = Gl{y_3}Ala:b\\
Z = Gl{y_4}Ala:c
\end{array} \right. \to \left\{ \begin{array}{l}
a + b + c = 0,1\\
8a + 9b + 11c = 0,42.2 + 0,16\\
2a + 4b + 5c = 0,42
\end{array} \right. \to \left\{ \begin{array}{l}
a = 0,02\\
b = 0,02\\
c = 0,06
\end{array} \right. \to \% _{Y\left( E \right)}^m = 4,17\% .\)
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