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Ta có: \(n_{SO_3}=\dfrac{8}{80}=0,1\left(mol\right)\)
a. PTHH: SO3 + H2O ---> H2SO4 (1)
b. Theo PT(1): \(n_{H_2SO_4}=n_{SO_3}=0,1\left(mol\right)\)
Đổi 250ml = 0,25 lít
=> \(C_{M_{H_2SO_4}}=\dfrac{0,1}{0,25}=0,4\left(M\right)\)
c. PTHH: H2SO4 + 2KOH ---> K2SO4 + 2H2O
Theo PT(2): \(n_{KOH}=2.n_{H_2SO_4}=2.0,1=0,2\left(mol\right)\)
=> \(m_{KOH}=0,2.56=11,2\left(g\right)\)
Ta có: \(C_{\%_{KOH}}=\dfrac{11,2}{m_{dd_{KOH}}}.100\%=5,6\%\)
=> \(m_{dd_{KOH}}=200\left(g\right)\)
Ta có: \(d_{KOH}=\dfrac{200}{V_{dd_{KOH}}}=1,045\)(g/ml)
=> \(V_{dd_{KOH}}=191,4\left(ml\right)\)
Nồng độ mol của dung dịch H 2 SO 4 :
n H 2 SO 4 = n SO 3 = 8/80 = 0,1 mol
Theo phương trình hoá học :
C Mdd H 2 SO 4 = 1000x0,1/250 = 0,4M
SO3 + H2O → H2SO4
\(n_{SO_3}=\frac{8}{80}=0,1\left(mol\right)\)
Theo PT: \(n_{H_2SO_4}=n_{SO_3}=0,1\left(mol\right)\)
\(\Rightarrow C_{M_{H_2SO_4}}=\frac{0,1}{25}=0,004\left(M\right)\)
hk chắc nha 😅😅😅😅
\(n_{KOH}=0,5.0,2=0,1\left(mol\right)\\ a,PTHH:2KOH+H_2SO_4\rightarrow K_2SO_4+2H_2O\\ b,n_{H_2SO_4}=n_{K_2SO_4}=\dfrac{n_{KOH}}{2}=\dfrac{0,1}{2}=0,05\left(mol\right)\\ V_{ddH_2SO_4}=\dfrac{0,05}{2}=0,025\left(l\right)\\ c,K_2SO_4+Ba\left(OH\right)_2\rightarrow2KOH+BaSO_4\downarrow\\ n_{Ba\left(OH\right)_2}=n_{BaSO_4}=n_{K_2SO_4}=0,05\left(mol\right)\\ m_{ddBa\left(OH\right)_2}=\dfrac{0,05.171.100}{5}=171\left(g\right)\\ m_{BaSO_4}=233.0,05=11,6\left(g\right)\)
Ta có: \(n_{Fe_2O_3}=\dfrac{9,6}{160}=0,06\left(mol\right)\)
a. PTHH: Fe2O3 + 3H2SO4 ---> Fe2(SO4)3 + 3H2O (1)
Theo PT(1): \(n_{H_2SO_4}=3.n_{Fe_2O_3}=3.0,06=0,18\left(mol\right)\)
=> \(m_{H_2SO_4}=0,18.98=17,64\left(g\right)\)
Ta có: \(C_{\%_{H_2SO_4}}=\dfrac{17,64}{m_{dd_{H_2SO_4}}}.100\%=9,8\%\)
=> \(m_{dd_{H_2SO_4}}=180\left(g\right)\)
b. Ta có: \(m_{dd_{Fe_2\left(SO_4\right)_3}}=9,6+180=189,6\left(g\right)\)
Theo PT(1): \(n_{Fe_2\left(SO_4\right)_3}=n_{Fe_2O_3}=0,06\left(mol\right)\)
=> \(m_{Fe_2\left(SO_4\right)_3}=0,06.400=24\left(g\right)\)
=> \(C_{\%_{Fe_2\left(SO_4\right)_3}}=\dfrac{24}{189,6}.100\%=12,66\%\)
c. PTHH: Fe2(SO4)3 + 3BaCl2 ---> 3BaSO4↓ + 2FeCl3 (2)
Theo PT(2): \(n_{BaSO_4}=3.n_{Fe_2\left(SO_4\right)_3}=3.0,06=0,18\left(mol\right)\)
=> \(m_{BaSO_4}=0,18.233=41,94\left(g\right)\)
Theo PT(2): \(n_{BaCl_2}=n_{BaSO_4}=0,18\left(mol\right)\)
=> \(m_{BaCl_2}=0,18.208=37,44\left(g\right)\)
Ta có: \(C_{\%_{BaCl_2}}=\dfrac{37,44}{m_{dd_{BaCl_2}}}.100\%=10,4\%\)
=> \(m_{dd_{BaCl_2}}=360\left(g\right)\)
Đổi 250ml=0,25l
\(SO_3+H_2O\)→\(H_2SO_4\)
+\(n_{SO_3}=\frac{8}{64}=0,125\left(mol\right)\)
+\(n_{H_2SO_4}=n_{SO_3}=0,125\left(mol\right)\)
+\(C_M=\frac{0,125}{0,25}=0,5M\)
ta có 250ml=0,25l
n\(_{SO_3}\)=\(\frac{m_{SO3}}{M_{SO3}}\)= \(\frac{8}{64}\) =0.125 (mol)
a.PTHH:SO3 + H2O-> H2SO4
b.Axit thu được là H2SO4
=> CM=\(\frac{n_{H_2SO_4}}{V_{H_2O}}\) = \(\frac{0.125}{0.25}\) = 0.5 M
a.SO2+H2O\(\leftrightarrow\)H2SO3
nH2SO3=1*0,2=0,2(mol)=>nSO2=0,2(mol)=>mSO2=0,2*64=12,8(g)
b.Ba(OH)2+H2SO3->BaSO3 +2H2O
nBa(OH)2=0,2(mol)=>VBa(OH)2=0,2/2=0,1(l)
nBaSO3=0,2(mol)=>mBaSO3=0,2*217=43,4(g)