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

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

Tức là SO₃ sẽ hòa tan vào trong nước tạo H₂SO₄

Mg + H₂SO₄ → MgSO₄ + H₂

\(n_{Mg}=\frac{2,4}{24}=0,1\left(mol\right)\)

a) Theo PT: \(n_{H_2}=n_{Mg}=0,1\left(mol\right)\)

\(\Rightarrow V_{H_2}=0,1\times22,4=2,24\left(l\right)\)

b) Theo pT: \(n_{H_2SO_4}=0,1\times98=9,8\left(g\right)\)

\(\Rightarrow m_{ddH_2SO_4}=\frac{9,8}{30\%}=32,67\left(g\right)\)

c) \(m_{H_2}=0,1\times2=0,2\left(g\right)\)

Ta có: \(m_{dd}saupư=2,4+32,67-0,2=34,87\left(g\right)\)

d) Theo pT: \(n_{MgSO_4}=n_{Mg}=0,1\left(mol\right)\)

\(\Rightarrow m_{MgSO_4}=0,1\times120=12\left(g\right)\)

\(\Rightarrow C\%_{MgSO_4}=\frac{12}{34,87}\times100\%=34,41\%\)

\(n_{SO_3}=\dfrac{200}{80}=2,5mol\\ m_{H_2SO_4}=200\cdot0,1=20g\\ SO_3+H_2O->H_2SO_4\\ C\%=\dfrac{20+2,5\cdot98}{200+200}\cdot100\%=66,25\text{%}\)

Câu b là H₂SO₄ loãng hay đặc vậy bn

\(a)Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_{\text{ 4}}\right)_3+3H_2O\\ n_{Fe_2O_3}=\dfrac{1,6}{160}=0,01\left(mol\right)\\ n_{H_2SO_4}=3n_{Fe_2O_3}=0,03\left(mol\right)\\m_{ddH_2SO_4}=\dfrac{0,03.98}{19,6\%}=15\left(g\right)\\ b)m_{ddsaupu}=1,6+15=16,6\left(g\right)\\ n_{Fe_2\left(SO_4\right)_3}=n_{Fe_2O_3}=0,01\left(mol\right)\\ C\%_{Fe_2\left(SO_4\right)_3}=\dfrac{0,01.400}{16,6}.100=24,1\%\)

\(n_{Fe2O3}=\dfrac{1,6}{160}=0,01\left(mol\right)\)

a) Pt : \(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O|\)

               1              3                   1                 3

             0,01         0,03                0,01

\(n_{H2SO4}=\dfrac{0,01.3}{1}=0,03\left(mol\right)\)

⇒ \(m_{H2SO4}=0,03.98=2,94\left(g\right)\)

\(m_{ddH2SO4}=\dfrac{2,94.100}{19,6}=15\left(g\right)\)

b) \(n_{Fe2\left(SO4\right)3}=\dfrac{0,03.1}{3}=0,01\left(mol\right)\)

⇒ \(m_{Fe2\left(SO4\right)3}=0,01.400=4\left(g\right)\)

\(m_{ddspu}=1,6+15=16,6\left(g\right)\)

\(C_{Fe2\left(SO4\right)3}=\dfrac{4.100}{16,6}=24,1\)⁰/₀

 Chúc bạn học tốt

\(S+H_2\underrightarrow{t^o}H_2S\)

\(2H_2S+3O_2\underrightarrow{t^o}2SO_2+2H_2O\)

\(2SO_2+O_2\underrightarrow{t^o}2SO_3\)

\(SO_3+H_2O\rightarrow H_2SO_4\)

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

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)

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

\(S+O_2\underrightarrow{t^o}SO_2\)

\(2SO_2+O_2\xrightarrow[t^o]{V_2O_5}2SO_3\)

\(SO_3+H_2O->H_2SO_4\)

\(2NaOH+H_2SO_4->Na_2SO_4+2H_2O\)

\(Na_2SO_4+BaCl_2->BaSO_4\downarrow+2NaCl\)