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a) pt: 2Al + 6HCl \(\rightarrow\) 2AlCl3 + 3H2
nAl = \(\dfrac{5,4}{27}=0,2mol\)
Theo pt: nH2 = \(\dfrac{3}{2}nAl=0,3mol\)
=> VH2 = 0,3.22,4 = 6,72lit
c) nHCl = 3nAl = 0,6mol
=> mHCl = 21,9g
=> C% = \(\dfrac{21,9}{200}.100\%=10,95\%\)
d) Bảo toàn khối lượng
mdung dich muối = mAl + mHCl - mH2
= 5,4 + 200 - 0,3.2 = 204,8g
Theo pt:nAlCl3 = nAl = 0,2mol
=> mAlCl3 = 0,2.133,5 = 26,7g
=> C%dd muối = \(\dfrac{26,7}{204,8}.100\%=13,03\%\)
e) H2 + CuO \(\xrightarrow[]{t^o}\) Cu + H2O
nCu = nH2 = 0,3mol
=> mCu = 0,3.64 = 19,2g
`a)PTHH:`
`2Al + 6HCl -> 2AlCl_3 + 3H_2`
`0,2` `0,6` `0,3` `(mol)`
`n_[Al]=[5,4]/27=0,2(mol)`
`b)V_[H_2]=0,3.22,4=6,72(l)`
`c)m_[dd HCl]=[0,6.36,5]/10 . 100 =219(g)`
a) \(PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\)
b) \(n_{H_2}=n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\\ V_{H_2\left(ĐKTC\right)}=0,1.22,4=2,24\left(l\right)\)
c) \(n_{HCl}=2n_{Zn}=2.0,1=0,2\left(mol\right)\\ C_{M_{ddHCl}}=\dfrac{0,2}{0,1}=2\left(M\right)\)
nAl=\(\dfrac{5,4}{27}\)=0,2 mol
2Al+3H2SO4→Al2(SO4)3+3H2
0,2-----0,3---------0,1-----------0,3
=>VH2=0,3.22,4=6,72l
=>CMH2SO4=\(\dfrac{0,3}{0,1}\)=3M
=>CM Al2(SO4)3=\(\dfrac{0,1}{0,1}\)=1M
a, \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
b, \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
Theo PT: \(n_{FeSO_4}=n_{Fe}=0,2\left(mol\right)\Rightarrow m_{FeSO_4}=0,2.152=30,4\left(g\right)\)
c, \(n_{H_2}=n_{Fe}=0,2\left(mol\right)\Rightarrow V_{H_2}=0,2.22,4=4,48\left(l\right)\)
d, \(n_{H_2SO_4}=n_{Fe}=0,2\left(mol\right)\Rightarrow C_{M_{H_2SO_4}}=\dfrac{0,2}{0,2}=1\left(M\right)\)
a.b.\(n_{Al}=\dfrac{m_{Al}}{M_{Al}}=\dfrac{5,4}{27}=0,2mol\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
0,2 0,3 ( mol )
\(V_{H_2}=n_{H_2}.22,4=0,3.22,4=6,72l\)
c.\(n_{CuO}=\dfrac{m_{CuO}}{M_{CuO}}=\dfrac{32}{80}=0,4mol\)
\(CuO+H_2\rightarrow Cu+H_2O\)
0,4 < 0,3 ( mol )
0,3 0,3 0,3 ( mol )
\(m_A=m_{CuO\left(du\right)}+m_{Cu}=\left[\left(0,4-0,3\right).80\right]+\left(0,3.64\right)=8+19,2=27,2g\)
a)
\(n_{Zn}=\dfrac{16,25}{65}=0,25\left(mol\right)\)
PTHH: Zn + H2SO4 --> ZnSO4 + H2
0,25-->0,25------------->0,25
=> VH2 = 0,25.22,4 = 5,6 (l)
b) \(C_{M\left(dd.H_2SO_4\right)}=\dfrac{0,25}{0,3}=\dfrac{5}{6}M\)
c) \(n_{Fe_2O_3}=\dfrac{32}{160}=0,2\left(mol\right)\)
PTHH: Fe2O3 + 3H2 --to--> 2Fe + 3H2O
Xét tỉ lệ: \(\dfrac{0,2}{1}>\dfrac{0,25}{3}\) => Fe2O3 dư, H2 hết
PTHH: Fe2O3 + 3H2 --to--> 2Fe + 3H2O
\(\dfrac{0,25}{3}\) <--0,25----->\(\dfrac{0,5}{3}\)
=> \(m=32-\dfrac{0,25}{3}.160+\dfrac{0,5}{3}.56=28\left(g\right)\)
PTHH: \(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)
đb: 0,25
a) số mol của Zn là: \(n_{Zn}=\dfrac{m_{Zn}}{M_{Zn}}=\dfrac{16,25}{65}=0,25\left(mol\right)\)
Theo PTHH, ta có: \(n_{H_2}=\dfrac{0,25\cdot1}{1}=0,25\left(mol\right)\)
Thể tích của H2 ở đktc là: \(V_{H_2\left(đktc\right)}=n_{H_2}\cdot22,4=0,25\cdot22,4=5,6\left(l\right)\)
2 câu còn lại mk chịu
\(n_{Al}=\dfrac{5.4}{27}=0.2\left(mol\right)\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
\(0.2.......0.3................................0.3\)
\(V_{H_2}=0.3\cdot22.4=6.72\left(l\right)\)
\(C_{M_{H_2SO_4}}=\dfrac{0.3}{0.1}=3\left(M\right)\)