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a.b.
\(n_{Fe}=\dfrac{2,8}{56}=0,05mol\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,05 0,1 0,05 ( mol )
\(V_{H_2}=0,05.22,4=1,12l\)
\(m_{HCl}=0,1.36,5=3,65g\)
c.
\(CuO+H_2\rightarrow\left(t^o\right)Cu+H_2O\)
0,05 0,05 ( mol )
\(m_{Cu}=0,05.64=3,2g\)
a. \(Fe+2HCl\rightarrow FeCl_2+H_2\)
b. \(n_{Fe}=\dfrac{m_{Fe}}{M_{Fe}}=\dfrac{28}{56}=0,5\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,5-------1---------0,5-----0,5
Theo PTHH: \(\Rightarrow n_{H_2}=n_{Fe}=0,5\left(mol\right)\)
\(V_{H_2}=n_{H_2}.22,4=0,5.22,4=11,2\left(l\right)\)
c. \(H_2+CuO\rightarrow Cu+H_2O\)
0,5-------0,5-----0,5----0,5
\(\Rightarrow m_{Cu}=n_{Cu}.M_{Cu}=0,5.64=32\left(g\right)\)
a, \(n_{Fe}=\dfrac{16,8}{56}=0,3\left(mol\right)\)
PTHH: Fe + 2HCl ---to---> FeCl2 + H2
Mol: 0,3 0,6 0,3
\(V_{H_2}=0,3.22,4=6,72\left(l\right)\)
\(m_{HCl}=0,6.36,5=21,9\left(g\right)\)
b, \(n_{CuO}=\dfrac{32}{80}=0,4\left(mol\right)\)
PTHH: H2 + CuO ---to---> Cu + H2O
Mol: 0,3 0,3
Ta có: \(\dfrac{0,3}{1}< \dfrac{0,4}{1}\) ⇒ H2 pứ hết, CuO dư
\(m_{Cu}=0,3.64=19,2\left(g\right)\)
\(n_{Mg}=\dfrac{3,6}{24}=0,15\left(mol\right)\)
\(PTHH:Mg+2HCl\rightarrow MgCl_2+H_2\)
\(\left(mol\right)\) \(0,15\) \(0,3\) \(0,15\) \(0,15\)
\(a.V_{H_2}=0,15.22,4=3,36\left(l\right)\\ b.m_{MgCl_2}=95.0,15=14,25\left(g\right)\\ c.\\ PTHH:CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
\(\left(mol\right)\) \(0,15\) \(0,15\) \(0,15\)
\(m_{Cu}=0,15.64=9,6\left(g\right)\)
a) \(n_{Fe}=\dfrac{m_{Fe}}{M_{Fe}}=\dfrac{28}{56}=0,5\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,5-------1---------0,5------0,5
b) \(V_{H_2}=n_{H_2}.22,4=0,5.22,4=11,2\left(l\right)\)
c) \(H_2+CuO\rightarrow Cu+H_2O\)
0,5-----0,5------0,5----0,5
Khối lượng đồng tạo thành: \(m_{Cu}=n_{Cu}.64=0,5.64=32\left(g\right)\)
a) \(n_{Fe}=\dfrac{28}{56}=0,5\left(mol\right)\)
PTHH: `Fe + 2HCl -> FeCl_2 + H_2`
0,5-------------------------->0,5`
b) `V_{H_2} = 0,5.22,4 = 11,2 (l)`
c) PTHH: \(CuO+H_2\xrightarrow[]{t^o}Cu+H_2O\)
0,5---->0,5
`=> m_{Cu} = 0,5.64 = 32 (g)`
\(Fe+2HCl\underrightarrow{t^o}FeCl_2+H_2\)
\(1mol\) \(1mol\)
\(0,5mol\) \(0,5mol\)
\(n_{Fe}=\dfrac{m}{M}=\dfrac{28}{56}=0,5\left(mol\right)\)
\(V_{H_2}=n.22,4=0,5.22,4=11,2\left(l\right)\)
\(H_2+CuO\underrightarrow{t^o}Cu+H_2O\)
\(1mol\) \(1mol\)
\(0,5mol\) \(0,5mol\)
\(m_{Cu}=n.M=0,5.64=32\left(g\right)\)
a) \(n_{Zn}=\dfrac{16,25}{65}=0,25\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
0,25-------------------->0,25
=> VH2 = 0,25.22,4 = 5,6 (l)
b)
PTHH: CuO + H2 --to--> Cu + H2O
0,25--->0,25
=> mCu = 0,25.64 = 16 (g)
PT: \(FeO+H_2\underrightarrow{t^o}Fe+H_2O\)
Ta có: \(n_{FeO}=\dfrac{7,2}{72}=0,1\left(mol\right)\)
a, Theo PT: \(n_{Fe}=n_{FeO}=0,1\left(mol\right)\)
\(\Rightarrow m_{Fe}=0,1.56=5,6\left(g\right)\)
b, Theo PT: \(n_{H_2}=n_{FeO}=0,1\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)
c, PT: \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
THeo PT: \(n_{Al}=\dfrac{2}{3}n_{H_2}=\dfrac{1}{15}\left(mol\right)\)
\(\Rightarrow m_{Al}=\dfrac{1}{15}.27=1,8\left(g\right)\)
`n_[Fe]=[5,6]/56=0,1(mol)`
`n_[HCl]=[10,95]/[36,5]=0,3(mol)`
`Fe + 2HCl -> FeCl_2 + H_2`
`0,1` `0,2` `0,1` `(mol)`
Ta có:`[0,1]/1 < [0,3]/2`
`=>HCl` dư
`a)V_[H_2]=0,1.22,4=2,24(l)`
`b)`
`H_2 + CuO` $\xrightarrow{t^o}$ `Cu + H_2 O`
`0,1` `0,1` `(mol)`
`=>m_[Cu]=0,1.64=6,4(g)`
\(a,n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\\ n_{HCl}=\dfrac{10,95}{36,5}=0,3\left(mol\right)\)
PTHH: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
bđ 0,1 0,3
pư 0,1 0,2
spư 0 0,1 0,1 0,1
\(\rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)
b, PTHH: \(H_2+CuO\xrightarrow[]{t^o}Cu+H_2O\)
0,1------------>0,1
\(\rightarrow m_{Cu}=0,1.64=6,4\left(g\right)\)