Đáp án:
1363,48l
Giải thích các bước giải:
\(\begin{array}{l}
V{C_2}{H_5}OH = \dfrac{{V{\rm{dd}} \times Dr}}{{100}} = \dfrac{{10 \times 70}}{{100}} = 7l\\
m{C_2}{H_5}OH = V \times D = 7000 \times 0,8 = 5600g\\
n{C_2}{H_5}OH = \dfrac{{5600}}{{46}} = \dfrac{{2800}}{{23}}\,mol\\
2{C_2}{H_5}OH + 2Na \to 2{C_2}{H_5}ONa + {H_2}\\
n{H_2} = \dfrac{{2800}}{{23}} \times \frac{1}{2} = \dfrac{{1400}}{{23}}\,mol\\
V{H_2} = n \times 22,4 = \dfrac{{1400}}{{23}} \times 22,4 = 1363,48l
\end{array}\)
