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Fe + H2SO4 -> FeSO4 + H2
nFe=0,5(mol)
Theo PTHH ta có:
nFeSO4=nFe=nH2=nH2SO4=0,5(mol)
mFeSO4=152.0,5=76(g)
VH2=22,4.0,5=11,2(lít)
Cách 1:
mH2SO4=98.0,5=49(g)
Cách 2:
Theo ĐLBTKL ta có:
mFe + mH2SO4=mFeSO4+mH2
=>mH2SO4=76+0,5.2-28=49(g)
`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)`
\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\\ Fe+H_2SO_4\rightarrow FeSO_4+H_2\uparrow\\ n_{H_2SO_4}=n_{H_2}=n_{FeSO_4}=n_{Fe}=0,2\left(mol\right)\\ a,m_{H_2SO_4}=0,2.98=19,6\left(g\right)\\ b,C\%_{ddH_2SO_4}=\dfrac{19,6}{200}.100=9,8\%\\ c,m_{FeSO_4}=152.0,2=30,4\left(g\right)\\ d,V_{H_2\left(đktc\right)}=0,2.22,4=4,48\left(l\right)\)
Ta có: \(n_{H_2}=\dfrac{74,37}{24,79}=3\left(mol\right)\)
PT: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
a, \(n_{Al}=\dfrac{2}{3}n_{H_2}=2\left(mol\right)\)
\(\Rightarrow m_{Al}=2.27=54\left(g\right)\)
b, \(n_{H_2SO_4}=n_{H_2}=3\left(mol\right)\)
\(\Rightarrow m_{H_2SO_4}=3.98=294\left(g\right)\)
a.
n Fe=28562856=0,5 (mol)
Fe+H2SO4→FeSO4+H2↑
0,5→0,5 0,5 0,5 (mol)
b.
V H2(đktc)=0,5.22,4=11,2 (l)
c.
m HCl=0,5.36,5=18,25 (g)
d.
m FeSO4=0,5.152=76 (g)
\(n_{Fe}=\dfrac{22,4}{56}=0,4\left(mol\right)\\ PTHH:Fe+H_2SO_4\rightarrow FeSO_4+H_2\\ Mol:0,4\rightarrow0,4\rightarrow0,4\rightarrow0,4\\ m_{H_2SO_4}=0,4.98=39,2\left(g\right)\\ V_{H_2}=0,4.22,4=8,96\left(l\right)\)
a)
\(2Al + 3H_2SO_4 \to Al_2(SO_4)_3 + 3H_2\)
b)
\(n_{H_2} = \dfrac{6.13,44}{22,4} = 3,6(mol)\)
Theo PTHH :
\(n_{Al} = \dfrac{2}{3}n_{H_2} = 2,4(mol)\\ \Rightarrow m_{Al} = 2,4.27 = 64,8(gam)\)
c)
\(4Al + 3O_2 \xrightarrow{t^o} 2Al_2O_3\)
Theo PT trên :
\(n_{O_2} = \dfrac{3}{4}n_{Al} = 1,8(mol)\\ \Rightarrow V_{O_2} = 1,8.22,4 = 40,32(lít)\)
a)\(PTHH:Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
b)
\(n_{H2}=\frac{4,48}{22,4}=0,2\left(mol\right)\)
Theo PTHH:
\(n_{FeSO4}=n_{H2SO4}=n_{H2}=0,2\left(mol\right)\)
Ta có:
\(m_{FeSO4}=0,2.152=30,4\left(g\right)\)
\(m_{H2SO4}=0,2.98=19,6\left(g\right)\)