cho 2,4g Fe2O3 hòa tan trongf 300g dd H2SO4 Dư Tính nồng độ C% của dd Muối thu đươc ??
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$m_{dd\ sau\ pư} = 2,4 + 300 = 302,4(gam)$
$Fe_2O_3 + 3H_2SO_4 \to Fe_2(SO_4)_3 + 3H_2O$
$n_{Fe_2(SO_4)_3} = n_{Fe_2O_3} = \dfrac{2,4}{160} = 0,015(mol)$
$C\%_{Fe_2(SO_4)_3} = \dfrac{0,015.400}{302,4}.100\% = 1,98\%$
Hi em mddFe2(SO4)3= mFe2O3+ mddH2SO4=302,4(g) chứ em!
Câu 1 :
\(n_{HCl}=\dfrac{73\cdot20\%}{36.5}=0.4\left(mol\right)\)
\(CuO+2HCl\rightarrow CuCl_2+H_2O\)
\(..........0.4.......0.2\)
\(m_{CuCl_2}=0.2\cdot135=27\left(g\right)\)
Câu 2 :
\(n_{Fe_2O_3}=\dfrac{2.4}{160}=0.015\left(mol\right)\)
\(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)
\(0.015...........................0.015\)
\(m_{dd}=2.4+300=302.4\left(g\right)\)
\(C\%_{Fe_2\left(SO_4\right)_3}=\dfrac{0.015\cdot400}{302.4}\cdot100\%=1.98\%\)
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)\(m_{Fe_2\left(SO_4\right)_3}=0,25.400=100\left(g\right)\)
\(m_{H_2O}=1,5.18=27\left(g\right)\)
\(C\%_{ddFe_2\left(SO_4\right)_3}=\dfrac{100.100}{100+27}=78,74\%\)
Ta có: \(n_{SO_2}=\dfrac{16,8}{22,4}=0,75\left(mol\right)\)
\(m_{H_2SO_4}=300.78,4\%=235,2\left(g\right)\Rightarrow n_{H_2SO_4}=\dfrac{235,2}{98}=2,4\left(mol\right)\)
PT: \(2Fe+6H_2SO_{4\left(đ\right)}\underrightarrow{t^o}Fe_2\left(SO_4\right)_3+3SO_2+6H_2O\)
____0,5____1,5________0,25______0,75 (mol)
\(\Rightarrow n_{H_2SO_4\left(dư\right)}=2,4-1,5=0,9\left(mol\right)\)
Ta có: m dd sau pư = mFe + m dd H2SO4 - mSO2
= 0,5.56 + 300 - 0,75.64 = 280 (g)
\(\Rightarrow\left\{{}\begin{matrix}C\%_{H_2SO_4\left(dư\right)}=\dfrac{0,9.98}{280}.100\%=31,5\%\\C\%_{Fe_2\left(SO_4\right)_3}=\dfrac{0,25.400}{280}.100\%\approx35,7\%\end{matrix}\right.\)
Bạn tham khảo nhé!
PTHH: \(MgO+H_2SO_4\rightarrow MgSO_4+H_2O\)
Ta có: \(\left\{{}\begin{matrix}n_{MgO}=\dfrac{40}{40}=1\left(mol\right)\\n_{H_2SO_4}=\dfrac{300\cdot98\%}{98}=3\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\) Axit còn dư
\(\Rightarrow\left\{{}\begin{matrix}n_{MgSO_4}=1\left(mol\right)\\n_{H_2SO_4\left(dư\right)}=2\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}C\%_{MgSO_4}=\dfrac{120}{300+40}\cdot100\%\approx35,3\%\\C\%_{H_2SO_4\left(dư\right)}=\dfrac{2\cdot98}{300+40}\cdot100\%\approx57,65\%\end{matrix}\right.\)
a)\(n_{Fe_2O_3}=0,2\left(mol\right)\)
PT:\(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)
\(0,2\) \(1,2\) \(0,4\)
\(\Rightarrow n_{FeCl_3}=0,4\left(mol\right)\)
\(\Rightarrow m_{FeCl_3}=65\left(g\right)\)
b) \(n_{HCl}=\dfrac{218.30\%}{35,5+1}=\dfrac{654}{365}\left(mol\right)\)
Từ PT \(\Rightarrow\)\(n_{HClpư}=1,2\left(mol\right)\)
\(\Rightarrow n_{HCldư}=\dfrac{654}{365}-1,2=\dfrac{216}{365}\left(mol\right)\)
\(\Rightarrow m_{HCldư}=21,6\left(g\right)\)
\(m_{dd}=32+218=250\left(g\right)\)
\(C\%_{FeCl_3}=\dfrac{65}{250}.100\%=26\left(\%\right)\)
\(C\%_{HCldu}=\dfrac{21,6}{250}.100\%=8,64\%\)
\(n_{Fe2O3}=\dfrac{4,8}{160}=0,03\left(mol\right)\)
Pt ; \(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O|\)
1 3 1 3
0,03 0,09 0,03
a) \(n_{H2SO4}=\dfrac{0,03.3}{1}=0,09\left(mol\right)\)
\(m_{H2SO4}=0,09.98=8,82\left(g\right)\)
\(m_{ddH2SO4}=\dfrac{8.82.100}{19,6}=45\left(g\right)\)
b) \(n_{Fe2\left(SO4\right)3}=\dfrac{0,09.1}{3}=0,03\left(mol\right)\)
⇒ \(m_{Fe2\left(SO4\right)3}=0,03.400=12\left(g\right)\)
\(m_{ddspu}=4,8+45=49,8\left(g\right)\)
\(C_{Fe2\left(SO4\right)3}=\dfrac{12.100}{49,8}=24,1\)0/0
Chúc bạn học tốt
\(n_{Fe_2O_3}=\frac{2,4}{160}=0,015\left(mol\right)\)
PTHH : Fe2O3 + 3H2SO4 -----> Fe2(SO4)3 + 3H2O
(mol) 0,015 0,045 0,015
\(\Rightarrow m_{Fe_2\left(SO_4\right)_3}=0,045\times400=18\left(g\right)\)
\(\Rightarrow\%Fe_2\left(SO_4\right)_3=\frac{18}{300}\times100=6\%\)