Cho 16g Fe2O3 pư vừa đủ với 500ml dd H2SO4 xM tính : a, CM H2SO4 (x) đã dùng b, CM dd muối thu được ?
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800ml = 0,8l
\(n_{H2SO4}=0,5.0,8=0,4\left(mol\right)\)
Pt : \(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O|\)
1 3 1 3
0,4 \(0,13\)
a) \(n_{Fe2\left(SO4\right)3}=\dfrac{0,4.1}{3}=0,13\left(mol\right)\)
⇒ \(m_{Fe2\left(SO4\right)3}=0,13.400=52\left(g\right)\)
b) \(C_{M_{Fe2\left(SO4\right)3}}=\dfrac{0,13}{0,8}=0,1625\left(M\right)\)
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a) Fe + H2SO4 -----------> FeSO4 + H2
\(n_{Fe}=n_{H_2}=0,75\left(mol\right)\)
=> \(m_{Fe}=0,75.56=42\left(g\right)\)
b) \(CM_{H_2SO_4}=\dfrac{0,75}{0,25}=3M\)
c) \(m_{ddsaupu}=42+250.1,1-0,75.2=315,5\left(g\right)\)
=> \(C\%_{FeSO_4}=\dfrac{0,75.152}{315,5}.100=36,13\%\)
\(n_{SO_2}=\dfrac{16,8}{22,4}=0,75\left(mol\right)\)
\(PTHH:2Fe+6H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3SO_2+6H_2O\)
Mol: 0,5 1,5 0,25 0,75 1,5
a)mFe=0,5.56=28 (g)
b)\(C_{MddH_2SO_4}=\dfrac{1,5}{0,25}=6\left(mol/l\right)\)
c)\(m_{Fe_2\left(SO_4\right)_3}=0,25.400=100\left(g\right)\)
\(m_{H_2O}=1,5.18=27\left(g\right)\)
\(C\%_{ddFe_2\left(SO_4\right)_3}=\dfrac{100.100}{100+27}=78,74\%\)
PTHH: \(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)
Ta có: \(n_{Fe_2O_3}=\dfrac{4,8}{160}=0,03\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{H_2SO_4}=0,09\left(mol\right)\\n_{Fe_2\left(SO_4\right)_3}=0,03\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{ddH_2SO_4}=\dfrac{0,09\cdot98}{9,8\%}=90\left(g\right)\\m_{Fe_2\left(SO_4\right)_3}=0,03\cdot400=12\left(g\right)\end{matrix}\right.\)
\(a,2Al+3H_2SO_4\to Al_2(SO_4)_3+3H_2\\ b,n_{H_2}=\dfrac{6,72}{22,4}=0,3(mol)\\ \Rightarrow n_{Al}=0,2(mol)\\ \Rightarrow m_{Al}=0,2.27=5,4(g)\\ c,n_{H_2SO_4}=0,3(mol)\\ \Rightarrow m_{dd_{H_2SO_4}}=\dfrac{0,3.98}{9,8\%}=300(g)\\ d,n_{Al_2(SO_4)_3}=0,1(mol)\\ \Rightarrow C\%_{Al_2(SO_4)_3}=\dfrac{0,1.342}{5,4+300-0,3.2}.100\%=11,22\%\)
\(^nNaOH=1.0,3=0,3\left(mol\right)\)
\(NaOH+HCl\rightarrow NaCl+H_2O\)
mol 0,3 0,3 0,3
a) \(CM_{HCl}=\dfrac{0,3}{0,2}=1,5M\)
b) \(CM_{d^2saupứ}=\dfrac{0,3}{0,3+0,2}=0,6M\)
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a) \(n_{NaOH}=0,3.1=0,3\left(mol\right)\)
\(NaOH+HCl\rightarrow NaCl+H_2O\)
\(n_{HCl}=n_{NaOH}=0,3\left(mol\right)\)
=> \(x=CM_{HCl}=\dfrac{0,3}{0,2}=1,5M\)
b) \(n_{NaCl}=n_{NaOH}=0,3\left(mol\right)\)
=> \(CM_{NaCl}=\dfrac{0,3}{0,3+0,2}=0,6M\)
\(n_{Fe2O3}=\dfrac{16}{160}=0,1\left(mol\right)\)
Pt : \(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O|\)
1 3 1 3
0,1 0,3 0,1
a) \(n_{H2SO4}=\dfrac{0,1.3}{1}=0,3\left(mol\right)\)
500ml = 0,5l
\(C_{M_{H2SO4}}=\dfrac{0,3}{0,5}=0,6\left(M\right)\)
b) \(n_{Fe2\left(SO4\right)3}=\dfrac{0,3.1}{3}=0,1\left(mol\right)\)
\(C_{M_{Fe2\left(SO4\right)3}}=\dfrac{0,1}{0,5}=0,2\left(M\right)\)
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Cảm ơn bạn nhiều 😍😍🥰🥰