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![](https://rs.olm.vn/images/avt/0.png?1311)
\(n_{H_2}=\dfrac{3,24}{24}=0,135(mol)\\ Fe+H_2SO_4\to FeSO_4+H_2\\ \Rightarrow n_{H_2SO_4}=n_{FeSO_4}=0,135(mol)\\ \Rightarrow \begin{cases} C_{M_{H_2SO_4}}=\dfrac{0,135}{0,2}=0,675M\\ C_{M_{FeSO_4}}=\dfrac{0,135}{0,2}=0,675M \end{cases}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
$Fe + H_2SO_4 \to FeSO_4 + H_2$
$n_{H_2SO_4} = n_{H_2} = n_{Fe} = \dfrac{16,8}{56} = 0,3(mol)$
$V = 0,3.22,4 = 6,72(lít)$
$C_{M_{H_2SO_4}} = \dfrac{0,3}{0,25} = 1,2M$
b)
$n_{CuO} = \dfrac{16}{80} = 0,2(mol)$
$CuO + H_2 \xrightarrow{t^o} Cu + H_2O$
$n_{CuO} < n_{H_2}$ nên $H_2$ dư
$n_{Cu} = n_{CuO} = 0,2(mol)$
$m_{Cu} = 0,2.64 = 12,8(gam)$
\(n_{Fe}=\dfrac{m}{M}=\dfrac{16,8}{56}=0,3\left(mol\right)\\ PT:Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
0,3 0,3 0,3 (mol)
a) V= n. 22,4 = 0,3 . 22,4 = 6,72(l)
\(C\%=\dfrac{m_{H_2SO_4}}{m_{dd}}.100\%=\dfrac{0,3.98}{200}.100\%=11,76\%\)
b) PT: \(H_2+CuO\underrightarrow{t^o}Cu+H_2O\)
0,3 0,3
=> mCu=n.M=0,3.64=19,2(g)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(n_{Al}=\dfrac{16,2}{27}=0,6\left(mol\right)\\ 2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\\ 0,6........0,9...........0,3........0,9\left(mol\right)\\ a.V_{H_2\left(đktc\right)}=0,9.22,4=20,16\left(l\right)\\ b.C_{MddH_2SO_4}=\dfrac{0,9}{0,5}=1,8\left(M\right)\\ c.C_{MddX}=C_{MddAl_2\left(SO_4\right)_3}=\dfrac{0,3}{0,5}=0,6\left(M\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) PTHH : \(Zn+H_2SO_4-->ZnSO_4+H_2\uparrow\) (1)
\(ZnO+H_2SO_4-->ZnSO_4+H_2O\) (2)
b) Theo pthh (1) : \(n_{Zn}=n_{H2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
=> \(m_{Zn}=0,1.65=6,5\left(g\right)\)
=> \(m_{ZnO}=22,7-6,5=16,2\left(g\right)\)
c) \(ZnO=\dfrac{16,2}{81}=0,2\left(mol\right)\)
Theo pthh (1) và (2) : \(\Sigma n_{H2SO4}=n_{Zn}+n_{ZnO}=0,1+0,2=0,3\left(mol\right)\)
=> \(C_{M\left(ddH2SO4\right)}=\dfrac{0,3}{0,1}=1,5M\)
a) PTHH : Zn+H2SO4−−>ZnSO4+H2↑Zn+H2SO4−−>ZnSO4+H2↑ (1)
ZnO+H2SO4−−>ZnSO4+H2OZnO+H2SO4−−>ZnSO4+H2O (2)
b) Theo pthh (1) : nZn=nH2=2,2422,4=0,1(mol)nZn=nH2=2,2422,4=0,1(mol)
=> mZn=0,1.65=6,5(g)mZn=0,1.65=6,5(g)
=> mZnO=22,7−6,5=16,2(g)mZnO=22,7−6,5=16,2(g)
c) ZnO=16,281=0,2(mol)ZnO=16,281=0,2(mol)
Theo pthh (1) và (2) : ΣnH2SO4=nZn+nZnO=0,1+0,2=0,3(mol)ΣnH2SO4=nZn+nZnO=0,1+0,2=0,3(mol)
=> CM(ddH2SO4)=0,30,1=1,5M
tích đúng đê
![](https://rs.olm.vn/images/avt/0.png?1311)
n Mg=4:24=1/6 mol
PTHH: Mg+H2SO4=> MgSO4+H2
1/6-->1/6--------->1/6-->1/6
=> CM( H2SO4)=1/6:0,2=0,8M
Nmg=\(\frac{4}{24}\)=\(\frac{1}{6}\)(mol)
đổi 200ml=0,2(l)
pt: mg+h2so4->mgso4+h2
tlmol: 1 1 1 1
mol: \(\frac{1}{6}\) \(\frac{1}{6}\) \(\frac{1}{6}\) \(\frac{1}{6}\)
a) nồng độ mol của dung dịch h2so4 là
Cm=\(\frac{n}{V}\)=\(\frac{\frac{1}{6}}{0.2}\) =0,83M
câu b)của bn câu hỏi í là sao ??
![](https://rs.olm.vn/images/avt/0.png?1311)
a,\(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
PTHH: Fe + H2SO4 → FeSO4 + H2
Mol: 0,1 0,1 0,1 0,1
b,\(V_{H_2}=0,1.22,4=2,24\left(l\right)\)
c,\(C_{M_{ddH_2SO_4}}=\dfrac{0,1}{0,2}=0,5M\)
d,\(C_{M_{ddFeSO_4}}=\dfrac{0,1}{0,2}=0,5M\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(n_{H_2}=\dfrac{3,36}{22,4}=0,15(mol)\\ a,Zn+2HCl\to ZnCl_2+H_2\\ \Rightarrow n_{Zn}=0,15(ml);n_{HCl}=0,3(mol)\\ a,m_{Zn}=0,15.65=9,75(g)\\ b,C_{M_{HCl}}=\dfrac{0,3}{0,1}=3M\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(n_{H2}=\dfrac{11,155}{24,79}\approx0,45\left(mol\right)\)
a) Pt : \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\uparrow\)
b) Theo Pt : \(n_{H2}=n_{Fe}=n_{H2SO4}=0,45\left(mol\right)\)
\(\Rightarrow m_{Fe}=0,45.56=25,2\left(g\right)\)
c) \(C_{MddH2SO4}=\dfrac{0,45}{0,6}=0,75\left(M\right)\)
Chúc bạn học tốt
a: \(Fe+3H_2SO_4->Fe\left(SO_4\right)_3+3H_2\)