Hòa tan 16 gam Fe2O3 vào dung dịch H2SO4 25%
a. Tính khối lượng dung dịch axit H2SO4 cần dùng
b. Tính nồng độ % của dung dịch muối thu được
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\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1mol\)
\(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)
0,1 0,3 0,1 0,3
\(m_{H_2SO_4}=0,3\cdot98=29,4\left(g\right)\)\(\Rightarrow m_{ddH_2SO_4}=\dfrac{29,4}{25}\cdot100=117,6\left(g\right)\)
\(m_{H_2O}=0,3\cdot18=5,4\left(g\right)\)
\(m_{Fe_2\left(SO_4\right)_3}=0,1\cdot400=40\left(g\right)\)
\(m_{ddsau}=16+117,6-5,4=128,2\left(g\right)\)
\(C\%=\dfrac{40}{128,2}\cdot100\%=31,2\%\)
Ta có: \(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
PTHH: Fe2O3 + 3H2SO4 ---> Fe2(SO4)3 + 3H2O
Theo PT: \(n_{H_2SO_4}=3.n_{H_2SO_4}=3.0,1=0,3\left(mol\right)\)
=> \(m_{H_2SO_4}=0,3.98=29,4\left(g\right)\)
Ta có: \(C_{\%_{H_2SO_4}}=\dfrac{29,4}{m_{dd_{H_2SO_4}}}.100\%=25\%\)
=> \(m_{dd_{H_2SO_4}}=117,6\left(g\right)\)
=> \(m_{dd_{Fe_2\left(SO_4\right)_3}}=117,6+16=133,6\left(g\right)\)
Theo PT: \(n_{Fe_2\left(SO_4\right)_3}=n_{Fe_2O_3}=0,1\left(mol\right)\)
=> \(m_{Fe_2\left(SO_4\right)_3}=0,1.400=40\left(g\right)\)
=> \(C_{\%_{Fe_2\left(SO_4\right)_3}}\dfrac{40}{133,6}.100\%=29,94\%\)
Bài 1: a) \(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
\(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)
Theo PT: \(n_{HCl}=6n_{Fe_2O_3}=0,6\left(mol\right)\)
=> \(m_{ddHCl}=\dfrac{0,6.36,5}{14,6\%}=150\left(g\right)\)
b) \(n_{FeCl_3}=2n_{Fe_2O_3}=0,2\left(mol\right)\)
=> \(m_{FeCl_3}=0,2.162,5=32,5\left(g\right)\)
a) \(Mg+H_2SO_4\rightarrow MgSO_4+H_2\)
Theo PT: \(n_{H_2}=n_{H_2SO_4}=\dfrac{4,9\%.100}{98}=0,05\left(mol\right)\)
=> \(V_{H_2}=0,05.22,4=1,12\left(l\right)\)
b)Theo PT: \(n_{Mg}=n_{H_2SO_4}=0,05\left(mol\right)\)
=> \(m_{Mg}=0,05.24=1,2\left(g\right)\)
\(n_{Al}=\dfrac{2,7}{27}=0,1mol\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
0,1 0,15 0 ,05 0,15
a)\(V=0,15\cdot22,4=3,36\left(l\right)\)
b)\(m_{H_2SO_4}=0,15\cdot98=14,7\left(g\right)\)
\(\Rightarrow m_{ddHCl}=\dfrac{14,7}{9,8}\cdot100=150\left(g\right)\)
c) \(m_{H_2}=0,15\cdot2=0,3\left(g\right)\)
\(m_{ddsau}=2,7+150-0,3=152,4\left(g\right)\)
\(m_{Al_2\left(SO_4\right)_3}=0,05\cdot342=17,1\left(g\right)\)
\(\Rightarrow C\%=\dfrac{17,1}{152,4}\cdot100=11,22\%\)
a)\(n_{MgO}\)=6:40=0,15(mol)
Ta có PTHH:
MgO+\(H_2SO_4\)->MgS\(O_4\)+\(H_2O\)
0,15......0,15...........0,15..................(mol)
Theo PTHH:\(m_{H_2SO_4}\)=0,15.98=14,7g
b)Ta có:\(m_{ddH_2SO_4}\)=D.V=1,2.50=60(g)
=>Nồng độ % dd \(H_2SO_4\) là:
\(C_{\%ddH_2SO_4}\)=\(\dfrac{14,7}{60}\).100%=24,5%
c)Theo PTHH:\(m_{MgSO_4}\)=0,15.120=18(g)
Khối lượng dd sau pư là:
\(m_{ddsau}\)=\(m_{MgO}\)+\(m_{ddH_2SO_4}\)=6+60=66(g)
Vậy nồng độ % dd sau pư là:
\(C_{\%ddsau}\)=\(\dfrac{18}{66}\).100%=27,27%
\(a,PTHH:CuO+H_2SO_4\rightarrow CuSO_4+H_2O\\ n_{CuSO_4}=n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\\ \Rightarrow m_{CuSO_4}=0,1\cdot160=16\left(g\right)\\ b,n_{H_2SO_4}=n_{CuO}=0,1\left(mol\right)\\ \Rightarrow m_{CT_{H_2SO_4}}=0,1\cdot98=9,8\left(g\right)\\ \Rightarrow C\%_{H_2SO_4}=\dfrac{9,8}{200}\cdot100\%=4,9\%\)
a, \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
b, \(n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\)
Theo PT: \(n_{H_2SO_4}=n_{H_2}=\dfrac{3}{2}n_{Al}=0,6\left(mol\right)\)
\(\Rightarrow m_{ddH_2SO_4}=\dfrac{0,6.98}{25\%}=235,2\left(g\right)\)
c, \(n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{2}n_{Al}=0,2\left(mol\right)\)
\(\Rightarrow C\%_{Al_2\left(SO_4\right)_3}=\dfrac{0,2.342}{10,8+235,2-0,6.2}.100\%\approx27,94\%\)
a)
Khối lượng của dung dịch:
\(m_{dd}=m_{ct}+m_{dm}=20+180=200\left(g\right)\)
Nồng độ phần trăm của dung dịch:
\(C\%=\dfrac{m_{ct}}{m_{dd}}.100\%=\dfrac{20}{200}.100\%=10\%\)
b) đề sai nha bạn
\(a.Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\\ b.n_{Fe_2O_3}=\dfrac{24}{160}=0,15\left(mol\right)\\ n_{H_2SO_4}=3.0,15=0,45\left(mol\right)\\ m_{ddH_2SO_4}=\dfrac{0,45.98.100}{14,7}=300\left(g\right)\\ m_{ddsau}=24+300=324\left(g\right)\\ n_{Fe_2\left(SO_4\right)_3}=n_{Fe_2O_3}=0,15\left(mol\right)\\ C\%_{ddFe_2\left(SO_4\right)_3}=\dfrac{0,15.400}{324}.100\approx18,519\%\)
Ta có: \(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
PT: \(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)
____0,1_______0,3________0,1 (mol)
a, \(m_{H_2SO_4}=0,3.98=29,4\left(g\right)\)
\(\Rightarrow m_{ddH_2SO_4}=\dfrac{29,4}{25\%}=117,6\left(g\right)\)
b, Ta có: m dd sau pư = 16 + 117,6 = 133,6 (g)
\(\Rightarrow C\%_{Fe_2\left(SO_4\right)_3}=\dfrac{0,1.400}{133,6}.100\%\approx29,94\%\)