\(m_{H_2SO_4}=\dfrac{20.50}{100}=10\left(g\right)\)

=> \(C\%\left(dd.sau.khi.pha\right)=\dfrac{10}{50}.100\%=20\%\)

\(m_{H_2O\left(thêm\right)}=50-20=30\left(g\right)\)

\(n_{H_2SO_4}=\dfrac{196.20\%}{98}=0,4\left(mol\right)\\ a,m_{H_2SO_4}=0,4.98=39,2\left(g\right)\\ b,m_{H_2O}=196-39,2=156,8\left(g\right)\)

Đáp án A

Gọi nồng độ ban đầu của H₂SO₄ là xM

n_H+ = 0,5.x.2 = x mol

[H⁺] = x/3 = 10^-3 suy ra x = 3.10^-3M

\(n_{BaCl_2}=\dfrac{52}{208}=0,25(mol)\\ BaCl_2+H_2SO_4\to BaSO_4\downarrow+2HCl\\ \Rightarrow n_{BaSO_4}=0,25(mol);n_{HCl}=0,5(mol)\\ \Rightarrow C\%_{HCl}=\dfrac{0,5.36,5}{52+150-0,25.233}.100\%=12,696\%\)

Ta có: \(n_{BaCl_2}=\dfrac{52}{208}=0,25\left(mol\right)\)

\(PTHH:BaCl_2+H_2SO_4--->BaSO_4\downarrow+2HCl\)

Theo PT: \(n_{HCl}=2.n_{BaCl_2}=2.0,25=0,5\left(mol\right)\)

\(\Rightarrow m_{HCl}=0,5.36,5=18,25\left(g\right)\)

Theo PT: \(n_{BaSO_4}=n_{BaCl_2}=0,25\left(mol\right)\)

\(\Rightarrow m_{BaSO_4}=0,25.233=58,25\left(g\right)\)

\(\Rightarrow m_{dd_{HCl}}=52+150-58,25=143,75\left(g\right)\)

\(\Rightarrow C_{\%_{HCl}}=\dfrac{18,25}{143,75}.100\%=12,7\%\)

giup mk voi

Đổi: 40ml = 0,04l

160ml = 0,16l

nH2SO4 = 0,04 . 8 = 0,32 (mol)

CMddH2SO4 (sau khi pha loãng) = 0,32/0,16 = 2M

n _H2SO4=0,04.8=0,32 mol

CmH2SO4=\(\dfrac{0,32}{0,16}\)=2M