\(m_{H_2SO_4}=400\times9,8\%=39,2\left(g\right)\)
\(\Rightarrow n_{H_2SO_4}=\frac{39,2}{98}=0,4\left(mol\right)\)
\(C_{M_{H_2SO_4}}mới=\frac{0,4}{5}=0,08\left(M\right)\)
Ta có : \(m_{H_2SO_4}=\frac{C\%.mdd}{100}=\frac{9,8.400}{100}=39,2g\)
\(\Rightarrow n_{H_2SO_4}=\frac{39,2}{98}=0,4mol\)
Vậy \(C_{M_{H_2SO_4}}=\frac{0,4}{5}=0,08mol/l\)
\(m_{H_2SO_4}=400.9,8\%=39,2\left(g\right)\)
\(\Rightarrow n_{H_2SO_4}=\frac{39,2}{98}=0,4\left(mol\right)\)
\(\Rightarrow\left[H_2SO_4\right]=\frac{0,4}{5}=0,08M\)
Lưu ý: [...H2SO4.....] = CM H2SO4
mH2SO4 = 400.9,8%=39,2 (g) => nH2SO4 = 0,4 (mol)
=> CM = \(\frac{0,4}{0,5}=0,8\left(M\right)\)