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a, PT: \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
b, Ta có: \(n_{Fe}=\dfrac{19,6}{56}=0,35\left(mol\right)\)
Theo PT: \(n_{H_2}=n_{Fe}=0,35\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,35.22,4=7,84\left(l\right)\)
c, Ta có: \(n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\)
PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Xét tỉ lệ: \(\dfrac{0,15}{1}< \dfrac{0,35}{1}\), ta được H2 dư.
Theo PT: \(n_{H_2\left(pư\right)}=n_{CuO}=0,15\left(mol\right)\)
\(\Rightarrow n_{H_2\left(dư\right)}=0,35-0,15=0,2\left(mol\right)\)
\(\Rightarrow m_{H_2\left(dư\right)}=0,2.2=0,4\left(g\right)\)
\(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\\ pthh:Mg+2HCl\rightarrow MgCl_2+H_2\)
0,2 0,4 0,2
\(\Rightarrow m_{HCl}=0,4.36,5=14,6\left(g\right)\\ V_{H_2}=0,2.22,4=4,48\left(l\right)\\ pthh:FeO+H_2\underrightarrow{t^o}Fe+H_2O\)
0,2 0,2 0,2
\(m_{Fe}=0,2.56=11,2\left(g\right)\)
$a)$
$Mg+H_2SO_4\to MgSO_4+H_2$
$b)$
$n_{Mg}=\frac{2,4}{24}=0,1(mol)$
Theo PT: $n_{MgSO_4}=n_{Mg}=0,1(mol)$
$\to m_{MgSO_4}=0,1.120=12(g)$
$c)$
$CuO+H_2\xrightarrow{t^o}Cu+H_2O$
Theo PT: $n_{Cu}=n_{H_2}=n_{Mg}=0,1(mol)$
$\to m_{Cu}=0,1.64=6,4(g)$
\(nZn=\dfrac{13}{65}=0,2\left(mol\right)\)
\(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)
1 1 1 1 (mol)
0,2 0,2 0,2 0,2 (mol)
\(VH_2=0,2.22,4=4,48\left(l\right)\)
\(Fe_2O_3+3H_2\rightarrow2Fe+3H_2O\)
1 3 2 3 (mol)
0,2 2/15 (mol)
\(mFe=\dfrac{2}{15}.56=7,47\left(g\right)\)
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.b.\(n_{Fe}=\dfrac{5,6}{56}=0,1mol\)
\(Fe+H_2SO_4\left(l\right)\rightarrow FeSO_4+H_2\)
0,1 0,1 0,1 ( mol )
\(m_{FeSO_4}=0,1.152=15,2g\)
\(V_{H_2}=0,1.22,4=2,24l\)
c.\(PbO+H_2\rightarrow\left(t^o\right)Pb+H_2O\)
0,1 0,1 ( mol )
\(m_{Pb}=0,1.207=20,7g\)
nFe = 5,6 : 56 = 0,1 (mol)
pthh : Fe + H2SO4 -> FeSO4 + H2
0,1 0,1 0,1
mFeSO4 = 0,1 . 152 = 15,2 (G)
VH2 = 0,1 . 22,4 = 2,24 (L)
pthh : PbO + H2 -t-> Pb + H2O
0,1 0,1
mPb = 207 . 0,1 = 20,7 (G)
PTHH: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\uparrow\)
Làm gộp các phần còn lại
Ta có: \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\) \(\Rightarrow\left\{{}\begin{matrix}n_{Al_2\left(SO_4\right)_3}=0,1mol\\n_{H_2SO_4}=n_{H_2}=0,3mol\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}V_{H_2}=0,3\cdot22,4=6,72\left(l\right)\\m_{Al_2\left(SO_4\right)_3}=0,1\cdot342=34,2\left(g\right)\\m_{H_2SO_4}=0,3\cdot98=29,4\left(g\right)\end{matrix}\right.\)
a)\(n_{Fe}=\dfrac{44,8}{56}=0,8mol\)
\(n_{H_2SO_4}=\dfrac{49}{98}=0,5mol\)
\(Fe+H_2SO_4\rightarrow FeSO_4+H_2\uparrow\)
0,8 0,5 0,5 0,5
b)\(V_{H_2}=0,5\cdot22,4=11,2l\)
c)\(CuO+H_2\rightarrow Cu+H_2O\)
0,5 0,5 0,5
\(m_{CuO}=0,5\cdot80=40g\)
`a)`
`Fe + H_2 SO_4 -> FeSO_4 + H_2`
`0,4` `0,4` `0,4` `(mol)`
`n_[Fe]=[22,4]/56=0,4(mol)`
`b)m_[FeSO_4]=0,4.152=60,8(g)`
`c)V_[H_2]=0,4.22,4=8,96(l)`
PT: \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
Ta có: \(n_{Fe}=\dfrac{2,8}{56}=0,05\left(mol\right)\)
a, Theo PT: \(n_{FeSO_4}=n_{Fe}=0,05\left(mol\right)\Rightarrow m_{FeSO_4}=0,05.152=7,6\left(g\right)\)
b, Theo PT: \(n_{H_2}=n_{Fe}=0,05\left(mol\right)\Rightarrow V_{H_2}=0,05.22,4=1,12\left(l\right)\)
c, PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Theo PT: \(n_{Cu\left(LT\right)}=n_{H_2}=0,05\left(mol\right)\)
\(\Rightarrow m_{Cu\left(TT\right)}=0,05.64=3,2\left(g\right)\)
Mà: mCu (TT) = 3,04 (g)
\(\Rightarrow H\%=\dfrac{3,04}{3,2}.100\%=95\%\)
PT: ��+�2��4→����4+�2Fe+H2SO4→FeSO4+H2
Ta có: ���=2,856=0,05(���)nFe=562,8=0,05(mol)
a, Theo PT: �����4=���=0,05(���)⇒�����4=0,05.152=7,6(�)nFeSO4=nFe=0,05(mol)⇒mFeSO4=0,05.152=7,6(g)
b, Theo PT: ��2=���=0,05(���)⇒��2=0,05.22,4=1,12(�)nH2=nFe=0,05(mol)⇒VH2=0,05.22,4=1,12(l)
c, PT: ���+�2��→��+�2�CuO+H2toCu+H2O
Theo PT: ���(��)=��2=0,05(���)nCu(LT)=nH2=0,05(mol)
⇒���(��)=0,05.64=3,2(�)⇒mCu(TT)=0,05.64=3,2(g)
Mà: mCu (TT) = 3,04 (g)
⇒�%=3,043,2.100%=95%⇒H%=3,23,04.100%=95%