Đáp án:
2,C
3,A
4,C
Giải thích các bước giải:
Câu 2:
\(\begin{array}{l}
C{H_3}COO{C_2}{H_5} + NaOH \to C{H_3}COONa + {C_2}{H_5}OH\\
{n_{C{H_3}COONa}} = 0,2mol\\
\to {n_{C{H_3}COO{C_2}{H_5}}} = {n_{C{H_3}COONa}} = 0,2mol\\
\to m = {m_{C{H_3}COO{C_2}{H_5}}} = 17,6g
\end{array}\)
Câu 3:
\(\begin{array}{l}
HCOO{C_2}{H_5} + KOH \to HCOOK + {C_2}{H_5}OH\\
{n_{KOH}} = 0,12mol\\
\to {n_{HCOO{C_2}{H_5}}} = {n_{KOH}} = 0,12mol\\
\to m = {m_{HCOO{C_2}{H_5}}} = 8,88g
\end{array}\)
Câu 4:
\(\begin{array}{l}
C{H_3}COO{C_2}{H_5} + NaOH \to C{H_3}COONa + {C_2}{H_5}OH\\
{n_{C{H_3}COO{C_2}{H_5}}} = 0,05mol\\
\to {n_{C{H_3}COONa}} = {n_{C{H_3}COO{C_2}{H_5}}} = 0,05mol\\
\to m = {m_{C{H_3}COONa}} = 4,1g
\end{array}\)
