SO3 + H2O => H2SO4

nSO3 = m/M = 200/80 = 2.5 (mol)

Theo phương trình: mH2SO4 = n.M = 98x2.5 = 245g

V = 1l=1000 ml, D =1.12g/ml

mddH2SO4 17% = D.V = 1000x1.12 = 1120g

mH2SO4 = 1120x17/100 = 190.4 (g)

C% = (190.4+245)x100/1365 = 31.9%

\(n_{SO_3}=\dfrac{200}{80}=2,5\left(mol\right)\)

m_{dd H2SO4 17%} = 1000.1,12 = 1120 (g)

=> \(m_{H_2SO_4}=\dfrac{1120.17}{100}=190,4\left(g\right)\)

PTHH: SO₃ + H₂O --> H₂SO₄

             2,5------------>2,5

=> m_{H2SO4(sau pư)} = 2,5.98 + 190,4 = 435,4 (g)

m_{dd sau pư} = 200 + 1120 = 1320 (g)

\(C\%_{dd.H_2SO_4.sau.pư}=\dfrac{435,4}{1320}.100\%=32,985\%\)

n_K = 

Pt: 2K + 2H₂O --> 2KOH + H₂

1 mol--------------------------> 0,5 mol

m_H2 = 0,5 . 2 = 1 (g)

mdd = m_K + m_nước - m_H2 = 39 + 362 - 1 = 400 (g)

C% dd KOH = 

https://hoc24.vn/hoi-dap/tim-kiem?id=562460&q=t%C3%ADnh%20n%E1%BB%93ng%20%C4%91%E1%BB%99%20ph%E1%BA%A7n%20tr%C4%83m%20c%E1%BB%A7a%20dung%20d%E1%BB%8Bch%20t%E1%BB%8Da%20th%C3%A0nh%20khi%20h%C3%B2a%20tan%20%3A%20%201%2F%2039g%20Kali%20v%C3%A0o%20362g%20n%C6%B0%E1%BB%9Bc%20%202%2F200g%20So3%20v%C3%A0o%201%20l%C3%ADt%20dung%20d%E1%BB%8Bch%20H2SO4%2017%25%20%28D%20%3D%201%2C12%20G%2FML%29

\(SO_3+H_2O\rightarrow H_2SO_4\)

\(n_{SO_3}=\dfrac{12}{80}=0,15\left(mol\right)\)

Theo PT: \(n_{H_2SO_4}=n_{SO_3}=0,15\left(mol\right)\)

\(\Rightarrow C\%_{H_2SO_4}=\dfrac{0,15.98}{12+100}.100\%=13,125\%\)

Câu B chịu nka~~

$n_{S{O}_3}=\frac{200}{80}=2,5\left(mol\right)$

$m_{dd{H}_{2}S{O}_4}=1000.1,12=1120g$

$\to m_{H_{2}S{O}_4\left(\text{dd bđ}\right)}=1120.17\%=190,4g$

$\to n_{H_{2}O(\text{dd bđ)}}=\frac{1120-190,4}{18}=51,6\left(mol\right)$

$S{O}_3+H_{2}O\to H_{2}S{O}_4$

$\to S{O}_3$ hết, $H_{2}O$ dư

$n_{H_2}$

$n_{H_{2}S{O}_4\text{tạo ra}}=2,5\left(mol\right)$

$\to m_{H_{2}S{O}_4\left(A\right)}=2,5.98+190,4=435,4g$

$m_A=m_{S{O}_3}+m_{\text{dd bđ}}=200+1120=1320g$

Vậy $C{\%}_{H_{2}S{O}_4}=\frac{435,4.100}{1320}=32,98\%$ 

_____________________ 

Lưu ý: Chất làm tăng khối lượng dd là $S{O}_3$, không có chất làm giảm khối lượng dd (khí, kết tủa)

Câu 1 : 

Gọi $n_{SO_3} = a(mol)$

$SO_3 + H_2O \to H_2SO_4$

Sau khi pha : 

$m_{dd} = 80a + 200(gam)$
$m_{H_2SO_4} = 98a + 200.9,8\% = 98a + 19,6(gam)$

Suy ra : $C\%_{H_2SO_4} = \dfrac{98a + 19,6}{200 + 80a}.100\% = 49\%$
$\Rightarrow a = 1,333(mol)$
$m_{SO_3} = 1,333.80 = 106,64(gam)$

Gọi $m_{oleum} = a(gam) ;  m_{H_2SO_4} = b(gam)$
Ta có : 

Sau khi trộn  :

$m_{oleum} = a + b(gam)$
$m_{SO_3} = a.71\% = 0,71a(gam)$

$\Rightarrow \%SO_3 = \dfrac{0,71a}{a + b}.100\% = 62\%$

$\Rightarrow a + b = 0,4402a$

$\Rightarrow \dfrac{a}{b} = \dfrac{1}{1 - 0,4402} = 1,78$

1. \(n_{H_2SO_4\left(98\%\right)}=\dfrac{30.1,84.98\%}{98}=0,552\left(mol\right)\)

=>\(V_{H_2SO_4\left(1M\right)}=\dfrac{0,552}{1}=0,552\left(l\right)\)