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Bài 2 :
\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
PTHH :
\(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)
0,1 0,3 0,1 0,3
\(m_{Fe_2\left(SO_4\right)_3}=0,1.400=40\left(g\right)\)
\(b,V_{ddH_2SO_4}=\dfrac{0,3}{2}=0,15\left(l\right)\)
\(c,C_{M\left(Fe_2\left(SO_4\right)_3\right)}=\dfrac{0,1}{0,15}=\dfrac{2}{3}\left(M\right)\)
Bài 3 :
\(n_{Mg}=\dfrac{4.8}{24}=0,2\left(mol\right)\)
PTHH :
\(Mg+H_2SO_4\rightarrow MgSO_4+H_2O\)
0,2 0,2 0,2 0,2
\(m_{MgSO_4}=0,2.120=24\left(g\right)\)
\(V_{H_2}=0,2.24,79=4,958\left(l\right)\)
\(c,C_{M\left(H_2SO_4\right)}=\dfrac{0,2}{0,2}=1\left(M\right)\)
\(d,C_{M\left(MgSO_4\right)}=\dfrac{0,2}{0,2}=1\left(M\right)\)
Bài 4 :
\(n_{Al}=\dfrac{8,1}{27}=0,3\left(mol\right)\)
PTHH :
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\uparrow\)
0,3 0,45 0,15 0,45
\(V_{H_2}=0,45.24,79=11,1555\left(l\right)\)
\(m_{H_2SO_4}=0,45.98=44,1\left(g\right)\)
\(C\%_{H_2SO_4}=\dfrac{44,1}{300}.100\%=14,7\%\)
\(m_{Al_2\left(SO_4\right)_3}=0,15.342=51,3\left(g\right)\)
\(m_{dd}=8,1+300-\left(0,45.2\right)=307,2\left(g\right)\)
\(C\%_{Al_2\left(SO_4\right)_3}=\dfrac{51,3}{307,2}.100\%\approx16,7\%\)
Bài 5 :
\(n_{H_2}=\dfrac{4,958}{24,79}=0,2\left(mol\right)\)
PTHH:
\(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
0,2 0,4 0,2 0,2
\(m_{Fe}=0,2.56=11,2\left(g\right)\)
\(C_{M\left(HCl\right)}=\dfrac{0,4}{0,2}=2\left(M\right)\)
\(C_{M\left(FeCl_2\right)}=\dfrac{0,2}{0,2}=1\left(M\right)\)
\(n_{Mg}=\dfrac{2,4}{24}=0,1\left(mol\right)\)
PTHH :
\(Mg+H_2SO_4\rightarrow MgSO_4+H_2\uparrow\)
0,1 0,1 0,1 0,1
\(a,m_{MgSO_4}=0,1.120=12\left(g\right)\)
\(b,V_{H_2}=0,1.22,4=2,24\left(l\right)\)
\(c,m_{ddH_2SO_4}=\dfrac{0,1.98.100}{10}=98\left(g\right)\)
\(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\\ 2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\\ 0,2........0,3...........0,1...........0,3\left(mol\right)\\ a.C_{MddH_2SO_4}=\dfrac{0,3}{0,3}=1\left(M\right)\\ b.m_{Al_2\left(SO_4\right)_3}=342.0,1=34,2\left(g\right)\\ c.V_{H_2\left(đktc\right)}=0,3.22,4=6,72\left(l\right)\)
PTHH: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
a) \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
\(n_{H_2SO_4}=\dfrac{3}{2}n_{Al}=0,3\left(mol\right)\)
\(\Rightarrow C_{M_{H_2SO_4}}=\dfrac{0,3}{0,3}=1M\)
b) \(n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{2}n_{Al}=0,1\left(mol\right)\)
\(\Rightarrow m_{Al_2\left(SO_4\right)_3}=n.M=0,1.342=34,2\left(g\right)\)
c) \(n_{H_2}=n_{H_2SO_4}=0,3\left(mol\right)\)
\(\Rightarrow V_{H_2}=n.22,4=0,3.22,4=6,72\left(l\right)\)
\(a,PTHH:Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{Fe}=\dfrac{22,4}{56}=0,4\left(mol\right)\\ b,n_{FeCl_2}=n_{H_2}=n_{Fe}=0,4\left(mol\right)\\ V_{H_2\left(đktc\right)}=0,4.22,4=8,96\left(l\right)\\ c,m_{FeCl_2}=127.0,4=50,8\left(g\right)\)
PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
Ta có: \(n_{Zn}=\dfrac{9,75}{65}=0,15\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{HCl}=0,3\left(mol\right)\\n_{ZnCl_2}=0,15\left(mol\right)=n_{H_2}\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}V_{H_2}=0,15\cdot22,4=3,36\left(l\right)\\m_{ZnCl_2}=0,15\cdot136=20,4\left(g\right)\\C_{M_{HCl}}=\dfrac{0,3}{0,2}=1,5\left(M\right)\end{matrix}\right.\)
Bài 3 : Trích mẫu thử :
Cho dung dịch BaCl2 vào 2 mẫu thử :
+ Chất nào xuất hiện kết tủa trắng không tan trong axit : H2SO4
Pt : \(BaCl_2+H_2SO_4\rightarrow BaSO_4+2HCl\)
Không hiện tượng : HCl
Chúc bạn học tốt
Bài 2 :
\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
Pt : \(Fe+H_2SO_4\rightarrow FeSO_4+H_2|\)
1 1 1 1
0,2 0,2 0,2 0,2
a) \(n_{H2SO4}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
\(V_{ddH2SO4}=\dfrac{0,2}{1}=0,2\left(l\right)\)
b) \(n_{H2}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
\(V_{H2\left(dktc\right)}=0,2.22,4=4,48\left(l\right)\)
c) \(n_{FeSO4}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
'\(C_{M_{FeSO4}}=\dfrac{0,2}{0,2}=1\left(M\right)\)
Chúc bạn học tốt
\(2CH_3COOH+Zn\rightarrow\left(CH_3COO\right)_2Zn+H_2\\ n_{H_2}=\dfrac{7,437}{24,79}=0,3\left(mol\right)\\ a,n_{CH_3COOH}=2.n_{H_2}=2.0,3=0,6\left(mol\right)\\ m_{ddCH_3COOH}=\dfrac{0,6.60.100}{20}=180\left(g\right)\\ b,n_{\left(CH_3COO\right)_2Zn}=n_{Zn}=n_{H_2}=0,3\left(mol\right)\\ C\%_{dd\left(CH_3COO\right)_2Zn}=\dfrac{0,3.183}{180+0,3.65-0,3.2}.100\approx27,602\%\)
a) 2Al+6HCl→→2AlCl3+3H2
b)
nAl=10,8\27=0,4(mol)
nAlCl3=nAl=0,4(mol)
mAlCl3=0,4.133,5=53,4(g)
c)
nH2=3\2nAl=0,6(mol)
VH2=22,4.0,6=13,44(l)
d) n HCl=0,4.6\2=1,2 mol
=>Cm HCl=1,2\0,1=12M
\(n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\)
a) Pt : \(2Al+6HCl\rightarrow2AlCl_3+3H_2|\)
2 6 2 3
0,4 1,2 0,4 0,6
b) \(n_{H2}=\dfrac{0,4.3}{2}=0,6\left(mol\right)\)
\(V_{H2\left(dktc\right)}=0,6.24,79=14,874\left(l\right)\)
c) \(n_{AlCl3}=\dfrac{0,6.2}{3}=0,4\left(mol\right)\)
⇒ \(m_{AlCl3}=0,4.133,5=53,4\left(g\right)\)
d) \(n_{HCl}=\dfrac{0,4.6}{2}=1,2\left(mol\right)\)
100ml = 0,1l
\(C_{M_{ddHCl}}=\dfrac{1,2}{0,1}=12\left(M\right)\)
Chúc bạn học tốt
Fe+2CH3COOH->(CH3COO)2Fe+H2
33\112-33\56---------------33\112
n Fe=\(\dfrac{33}{112}\) mol
=>m (CH3COO)2Fe=\(\dfrac{33}{112}\).174=51,267g
=>VCH3COOH=\(\dfrac{\dfrac{33}{56}}{3}=0,196l\)
\(n_{Fe}=\dfrac{16,5}{56}=0,29mol\)
\(Fe+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Fe+H_2\)
0,29 0,58 0,29 0,29 ( mol )
\(V_{H_2}=0,29.22,4=6,496l\)
\(m_{\left(CH_3COO\right)_2Fe}=0,29.174=50,46g\)
\(C_{M_{CH_3COOH}}=\dfrac{0,29}{0,3}=0,96M\)