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Câu 3:
c, Từ phần trên, có nH2 = nFe = 0,1 (mol)
\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
\(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
Xét tỉ lệ: \(\dfrac{0,1}{1}>\dfrac{0,1}{3}\), ta được Fe2O3 dư.
Theo PT: \(n_{Fe}=\dfrac{2}{3}n_{H_2}=\dfrac{1}{15}\left(mol\right)\Rightarrow m_{Fe}=\dfrac{1}{15}.56=\dfrac{56}{15}\left(g\right)\)
a) \(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
PTHH: `Fe + 2HCl -> FeCl_2 + H_2`
0,1-->0,2----->0,1------>0,1
`=> m_{FeCl_2} = 0,1.127 = 12,7 (g)`
b) `V_{H_2} = 0,1.22,4 = 2,24 (l)`
c) `n_{Fe_2O_3} = (16)/(160) = 0,1 (mol)`
PTHH: \(Fe_2O_3+3H_2\xrightarrow[]{t^o}2Fe+3H_2O\)
Xét tỉ lệ: \(0,1>\dfrac{0,1}{3}\Rightarrow\) Fe2O3
Theo PT: \(n_{Fe}=\dfrac{2}{3}.n_{H_2}=\dfrac{1}{15}\left(mol\right)\)
\(\Rightarrow m_{Fe}=\dfrac{1}{15}.56=\dfrac{56}{15}\left(g\right)\)
\(n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\\ pthh:2Al+6HCl\rightarrow2AlCl_3+3H_2\)
Mol : 0,4 0,4 0,6
\(m_{AlCl_3}=133,5.0,4=53,4\left(g\right)\\ V_{H_2}=0,6.22,4=13,44\left(l\right)\)
\(n_{CuO}=\dfrac{8}{80}=0,8\left(mol\right)\\
pthh:CuO+H_2\underrightarrow{t^o}Cu+H_2O\\
LTL:\dfrac{0,8}{1}>\dfrac{0,6}{1}\)
=> CuO dư
\(n_{CuO\left(p\text{ư}\right)}=n_{Cu}=n_{H_2}=0,6\left(mol\right)\\
m_{CuO\left(d\right)}=\left(0,8-0,6\right).80=16\left(g\right)\\
m_{Cu}=0,6.64=38,4\left(g\right)\\
m_{cr}=16+38,4=54,4\left(g\right)\)
nFe = 11,2/56 = 0,2 (mol)
PTHH: Fe + 2HCl -> FeCl2 + H2
Mol: 0,2 ---> 0,4 ---> 0,2 ---> 0,2
VH2 = 0,2 . 22,4 = 4,48 (l)
PTHH: CuO + H2 -> (to) Cu + H2O
Mol: 0,2 <--- 0,2 ---> 0,2
mCu = 0,2 . 64 = 12,8 (g)
a, \(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
b, \(n_{Fe_2O_3}=\dfrac{24}{160}=0,15\left(mol\right)\)
Theo PT: \(n_{H_2}=3n_{Fe_2O_3}=0,45\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,45.22,4=10,08\left(l\right)\)
c, n\(n_{Fe}=2n_{Fe_2O_3}=0,3\left(mol\right)\)
PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
Theo PT: \(n_{HCl}=2n_{Fe}=0,6\left(mol\right)\Rightarrow V_{HCl}=\dfrac{0,6}{1,5}=0,4\left(M\right)\)
\(n_{Fe}=\dfrac{5.6}{56}=0.1\left(mol\right)\)
\(n_{HCl}=\dfrac{10.95}{36.5}=0.3\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
Lập tỉ lệ :
\(\dfrac{0.2}{1}>\dfrac{0.3}{2}\Rightarrow Fedư\)
Khi đó :
\(n_{FeCl_2}=n_{H_2}=\dfrac{1}{2}\cdot n_{HCl}=\dfrac{1}{2}\cdot0.3=0.15\left(mol\right)\)
\(m_{FeCl_2}=0.15\cdot127=19.05\left(g\right)\)
\(V_{H_2}=0.15\cdot22.4=3.36\left(l\right)\)
\(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\\ n_{HCl}=\dfrac{10,95}{36,5}=0,3\left(mol\right)\\ PTHH:Fe+2HCl\rightarrow FeCl_2+H_2\\ Vì:\dfrac{0,1}{1}< \dfrac{0,3}{2}\\ \Rightarrow HCldư\\ \Rightarrow n_{FeCl_2}=n_{Fe}=n_{H_2}=0,1\left(mol\right)\\ \Rightarrow m_{FeCl_2}=127.0,1=12,7\left(g\right)\\ V_{H_2\left(đktc\right)}=0,1.22,4=2,24\left(l\right)\)
\(n_{Zn}=\dfrac{1,625}{65}=0,025mol\)
\(n_{HCl}=\dfrac{3,65}{36,5}=0,1mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,025 < 0,1 ( mol )
0,025 0,05 0,025 0,025 ( mol )
\(V_{H_2}=0,025.22,4=0,56l\)
Chất dư là HCl
\(m_{HCl\left(dư\right)}=\left(0,1-0,05\right).36,5=1,825g\)
\(m_{ZnCl_2}=0,025.136=3,4g\)
huhu cảm ơn bạn đề dài quá nên đưa lên đây làm giúp
\(n_{HCl}=0,2.2=0,4\left(mol\right)\\ PTHH:Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{Fe}=n_{H_2}=n_{FeCl_2}=\dfrac{0,4}{2}=0,2\left(mol\right)\\ a,m_{Fe}=0,2.56=11,2\left(g\right)\\ b,V_{H_2\left(đktc\right)}=0,2.22,4=4,48\left(l\right)\\ c,V_{ddFeCl_2}=V_{ddHCl}=0,2\left(l\right)\\ C_{MddFeCl_2}=\dfrac{0,2}{0,2}=1\left(M\right)\)
nFe = 5.6/56 = 0.1 (mol)
nHCl = 0.2*2 = 0.4 (mol)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
LTL : 0.1/1 < 0.4/2 => HCl dư
mHCl dư = ( 0.4 - 0.2 ) * 36.5 = 7.3 (g)
VH2 = 0.2*22.4 = 4.48 (l)
CM FeCl2 = 0.1/0.2 = 0.5(M)
CM HCl dư = 0.2 / 0.2 = 1(M)
a) nFe= 5,6/56=0,1(mol)
nHCl=10,95/36,5=0,3(mol)
PTHH: Fe + 2 HCl -> FeCl2 + H2
Ta có: 0,3/2 > 0,1/1
=> HCl dư, Fe hết, tính theo nFe
-> nH2=nFeCl2=nFe=0,1(mol)
=> V(H2,đktc)=0,1.22,4=2,24(l)
mFeCl2=0,1.127=12,7(g)
\(n_{Ca}=\dfrac{8}{40}=0,2\left(mol\right)\)
PTHH: Ca + 2H2O ---> Ca(OH)2 + H2
0,2 0,2
Fe2O3 + 3H2 --to--> 2Fe + 3H2O
0,2 \(\dfrac{2}{15}\)
\(\rightarrow\left\{{}\begin{matrix}V_{H_2}=0,2.22,4=4,48\left(l\right)\\m_{Fe}=\dfrac{2}{15}.56=\dfrac{112}{15}\left(g\right)\end{matrix}\right.\)
\(n_{Ca}=8:40=0,2\left(mol\right)\)
pthh : \(Ca+2H_2O->Ca\left(OH\right)_2+H_2\)
0,2 0,2
=> \(V_{H_2}=0,2.22,4=4,48\left(L\right)\)
\(pthh:Fe_2O_3+3H_2-t^o->2Fe+3H_2O\)
0,2 \(\dfrac{2}{15}\)
=> \(m_{Fe}=\dfrac{2}{15}.56=\dfrac{112}{15}\left(G\right)\)