Cho 16,5 gam iron Fe tách hết với dung dịch acetic acid CH3COOH 3M a/ Tính thể tích khí sinh ra(đktc) b/ tính khối lượng muối thu được c/ tính thể tích dung dịch acid đã từng
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\(n_{Fe}=\dfrac{14}{56}=0,25\left(mol\right)\\
pthh:Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
0,25 0,25 0,25
=> \(V_{H_2}=0,25.22,4=5,6\left(l\right)\)
\(m_{FeSO_4}=152.0,25=38\left(g\right)\)
\(pthh:CuO+H_2\underrightarrow{t^o}H_2O+Cu\)
0,25 0,25 0,25
=> \(m_{Cu}=0,25.64=16\left(g\right)\)
nFe = 14/56 =0,25 mol
PTHH : Fe + H2SO4 => FeSO4 + H2 (1)
Theo pt(1) : nH2 = nFe = 0,25 mol
VO2 = 0,25 x 22,4 = 5,6 l
Theo pt(1): nFeSO4 = nFe = 0,25 mol
mFeSO4= 0,25 x 152 = 38 g
PTHH : H2 + CuO => Cu + H2O(2)
theo pt (2) => nH2 = nCu = 0,25 mol
mCu = 0,25 x 64 = 16 g
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) \(n_{H_2}=n_{H_2SO_4}=0,3\left(mol\right)\)
\(\Rightarrow V_{H_2}=n.22,4=0,3.22,4=6,72\left(l\right)\)
\(n_{Fe}=\dfrac{6,72}{56}=0,12\left(mol\right)\\ Fe+H_2SO_{4\left(loãng\right)}\rightarrow FeSO_4+H_2\uparrow\\ Mol:0,12\rightarrow0,12\rightarrow0,12\rightarrow0,12\\ V_{H_2}=0,12.22,4=2,688\left(l\right)\\ m_{FeSO_4}=0,12.152=18,24\left(g\right)\\ PTHH:Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\\ Mol:0,04\leftarrow0,12\rightarrow0,08\\ m_{Fe}=0,08.56=4,48\left(g\right)\)
a) Mg + 2HCl --> MgCl2 + H2
b) \(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)
PTHH: Mg + 2HCl --> MgCl2 + H2
0,2--->0,4-------------->0,2
=> mHCl = 0,4.36,5 = 14,6 (g)
c) \(V_{H_2}=0,2.22,4=4,48\left(l\right)\)
d)
PTHH: CuO + H2 --to--> Cu + H2O
0,2------->0,2
=> mCu = 0,2.64 = 12,8 (g)
\(a,PTHH:Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{Fe}=\dfrac{22,4}{56}=0,4\left(mol\right)\\ b,n_{FeCl_2}=n_{H_2}=n_{Fe}=0,4\left(mol\right)\\ V_{H_2\left(đktc\right)}=0,4.22,4=8,96\left(l\right)\\ c,m_{FeCl_2}=127.0,4=50,8\left(g\right)\)
a) PT: Fe+2HCl→FeCl2+H2 (1)
- Số mol Fe là:
nFe=\(\dfrac{m}{M}\)=\(\dfrac{11,2}{56}\)=0,2(mol)
- Theo PT (1)⇒nFeCl2=nFe=0,2(mol)
- Vậy khối lượng của FeCl2 là:
mFeCl2=n.M=0,2.127=25,4(g)
b) Theo PT (1)⇒nH2=nFe=0,2(mol)
- Vậy thể tích của H2 là:
VH2=n.24,79=0,2.24,79=4,958(l)
`#3107.101107`
`a)`
\(\text{Fe + 2HCl}\rightarrow\text{FeCl}_2+\text{H}_2\)
n của Fe có trong phản ứng là:
\(\text{n}_{\text{Fe}}=\dfrac{\text{m}_{\text{Fe}}}{\text{M}_{\text{Fe}}}=\dfrac{11,2}{56}=0,2\left(\text{mol}\right)\)
Theo PT: \(\text{n}_{\text{Fe}}=\text{n}_{\text{ }\text{FeCl}_2}=0,2\left(\text{mol}\right)\)
m của FeCl2 có trong phản ứng là:
\(\text{m}_{\text{FeCl}_2}=\text{n}_{\text{FeCl}_2}\cdot\text{M}_{\text{FeCl}_2}=0,2\cdot\left(56+35,5\cdot2\right)=25,4\left(\text{g}\right)\)
`b)`
Theo PT: \(\text{n}_{\text{Fe}}=\text{n}_{\text{H}_2}=0,2\left(\text{mol}\right)\)
V của khí H2 ở đkc là:
\(\text{V}_{\text{H}_2}=\text{n}_{\text{H}_2}\cdot24,79=0,2\cdot24,79=4,958\left(\text{l}\right)\)`.`
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 )
\(V_{H_2}=0,29.22,4=6,496l\)
\(m_{\left(CH_3COO\right)_2Fe}=0,29.174=50,46g\)
\(C_{M_{CH_3COOH}}=\dfrac{0,29}{0,3}=0,96M\)