a) ta có : mNaOH = 8g
=> nNaOH = 8 / 40 = 0,2 (mol)
b) ta có \(\left\{{}\begin{matrix}m_{ddH2SO4}=200g\\C\%=10\%\end{matrix}\right.\)
=> mH2SO4 = 20 g
⇒ nH2SO4= \(\frac{20}{98}\approx0,2\left(mol\right)\)
c) \(\left\{{}\begin{matrix}V_{ddHCl}=300ml=0,3l\\C_M=0,1M\end{matrix}\right.\)
=> nHCl =0,3 . 0,1 = 0,03mol
a) \(n_{NaOH}=\frac{8}{40}=0,2\left(mol\right)\)
b) \(m_{H_2SO_4}=200\times10\%=20\left(g\right)\)
\(\Rightarrow n_{H_2SO_4}=\frac{20}{98}=\frac{10}{49}\left(mol\right)\)
c) \(n_{HCl}=0,3\times0,1=0,03\left(mol\right)\)