a, Độ rượu thu được là: \(\dfrac{30}{30+90}.100=25^o\)
b, Ta có: \(m_{C_2H_5OH}=30.0,8=24\left(g\right)\Rightarrow n_{C_2H_5OH}=\dfrac{24}{46}=\dfrac{12}{23}\left(mol\right)\)
PT: \(2C_2H_5OH+2Na\rightarrow2C_2H_5ONa+H_2\)
_______12/23____________________6/23 (mol)
\(\Rightarrow V_{H_2}=\dfrac{6}{23}.22,4\approx5,84\left(l\right)\)
Bạn tham khảo nhé!