SO3 + H2O---> H2SO4

nSO3=200/80=2,5(mol)

Theo pt:

nSO3=nH2SO4=2,5(mol)

mH2SO4=98.2,5=245(g)

mdd H2SO4 17 % =1000.1,12=1120(g)

mH2SO4trong dd=1120.17/100=190,4(g)

=>C%

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%

SO3 + H2O = H2SO4
(32+3*16)= 80........(2+32+4*16)=98
200g.......................x(g)
x= (200 * 98) / 80 = 245g
khoi luong dd H2SO4 truoc phan ung la: m = d * v = 1.12 * 1000 = 1120g
khoi luong H2SO4 truoc pu la: m = (1120 * 17) / 100 = 190.4g
khoi luong H2SO4 sau pu la: m = 190.4 + 245 = 435.4g
khoi luong dd H2SO4 sau pu la: m = 1120 + 200 = 1320g
C% cua dd thu duoc la: C%= ( 435.4 / 1320) *100 = 32.985%

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

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 = 39/400.100%=9,75%

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\(SO_3+H_2O\rightarrow H_2SO_4\)

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

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~~

→nH2O(dd bđ)=1120−190,418=51,6(mol)→nH2O(dd bđ)=1120−190,418=51,6(mol)

$S{}^{}+{}^{}O\to {}^{}S{}^{}$

$\to S{}^{}$ hết, ${}^{}O$ dư

nH2

PTHH: \(SO_3+H_2O\rightarrow H_2SO_4\)

Ta có: \(n_{SO_3}=\dfrac{200}{80}=2,5\left(mol\right)=n_{H_2SO_4}\)

Mặt khác: \(m_{ddH_2SO_4}=1000\cdot1,12=1120\left(g\right)\) \(\Rightarrow m_{H_2SO_4\left(ban.đầu\right)}=1120\cdot17\%=190,4\left(g\right)\)

Bảo toàn khối lượng: \(m_{ddH_2SO_4\left(sau\right)}=m_{SO_3}+m_{ddH_2SO_4\left(ban.đầu\right)}=1320\left(g\right)\)

\(\Rightarrow C\%=\dfrac{2,5\cdot98+190,4}{1320}\cdot100\%\approx32,98\%\)

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.

\(m_{H_2SO_4\left(9.8\%\right)}=200\cdot9.8\%=19.6\left(g\right)\)

\(n_{H_2SO_4}=\dfrac{19.6}{98}=0.2\left(mol\right)\)

\(TC:n_{SO_3}=a\left(mol\right)\)

\(SO_3+H_2O\rightarrow H_2SO_4\)

\(a................a\)

\(m_{H_2SO_4\left(tt\right)}=98a\left(g\right)\)

\(m_{H_2SO_4\left(tổng\right)}=19.6+98a\left(g\right)\)

\(m_{dd_{H_2SO_4}}=200+80a\left(g\right)\)

\(C\%_{H_2SO_4}=\dfrac{19.6+98a}{200+80a}\cdot100\%=49\%\)

\(\Rightarrow a=\dfrac{4}{3}\)

\(m_{SO_3}=\dfrac{4}{3}\cdot80=106.67\left(g\right)\)

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

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