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1)
a) Từ trái qua phải :
\(4FeS+7O_2\xrightarrow[]{t^o}2Fe_2O_3+4SO_2\)
\(2SO_2+O_2\xrightarrow[V_2O_5]{t^o}2SO_3\)
\(SO_3+H_2O\rightarrow H_2SO_4\)
\(Cu+2H_2SO_{4\left(đ,n\right)}\rightarrow CuSO_4+H_2O+SO_2\uparrow\)
Bạn xem lại chỗ H2SO4 cho ra Cu nhé
b) Từ trái qua phải :
\(Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
\(Al_2\left(SO_4\right)_3+3NaOH\rightarrow Al\left(OH\right)_3+3Na_2SO_4\)
\(2Al\left(OH\right)_3\xrightarrow[]{t^o}Al_2O_3+3H_2O\)
2) \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)
0,2 -->0,6--------->0,2------>0,3
a) \(m_{ddHCl}=\dfrac{\left(0,6.36,5\right)}{7,3\%}.100\%=300\left(g\right)\)
b) \(m_{ddspu}=5,4+300-0,3.2=304,8\left(g\right)\)
\(C\%_{AlCl3}=\dfrac{0,2.133,5}{304,8}.100\%=8,75\%\)
b) \(Al\underrightarrow{1}Al_2O_3\underrightarrow{2}Al\underrightarrow{3}Al_2\left(SO_4\right)_3\underrightarrow{4}Al\left(OH\right)_3\underrightarrow{5}Al_2O_3\)
(1) \(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)
(2) \(2Al_2O_3\xrightarrow[điện.phân.nóng.chảy]{criolit}4Al+3O_2\)
(3) \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
(4) \(Al_2\left(SO_4\right)_3+6KOH\rightarrow2Al\left(OH\right)_3+3K_2SO_4\)
(5) \(2Al\left(OH\right)_3\underrightarrow{t^o}Al_2O_3+3H_2O\)
Chúc bạn học tốt
Câu 3 :
200ml = 0,2l
\(n_{Zn}=\dfrac{1,95}{65}=0,03\left(mol\right)\)
a) Pt : \(Zn+2HCl\rightarrow ZnCl_2+H_2|\)
1 2 1 1
0,03 0,03 0,03
b) \(n_{H2}=\dfrac{0,03.1}{1}=0,03\left(mol\right)\)
\(V_{H2\left(dktc\right)}=0,03.24,79=0,7437\left(l\right)\)
c) \(n_{ZnCl2}=\dfrac{0,03.1}{1}=0,03\left(mol\right)\)
\(C_{M_{ZnCl2}}=\dfrac{0,03}{0,2}=0,15\left(M\right)\)
Chúc bạn học tốt
Sửa: \(14,7\%\)
\(n_{H_2SO_4}=\dfrac{200.14,7\%}{100\%.98}=0,3(mol)\\ a,PTHH:2Al+3H_2SO_4\to Al_2(SO_4)_3+3H_2\\ \Rightarrow n_{H_2}=0,3(mol)\\ \Rightarrow V_{H_2}=0,3.22,4=6,72(l)\\ b,n_{Al}=\dfrac{2}{3}n_{H_2SO_4}=0,2(mol)\\ \Rightarrow m_{Al}=0,2.27=5,4(g)\\ c,n_{Al_2(SO_4)_3}=\dfrac{1}{2}n_{Al}=0,1(mol)\\ \Rightarrow C\%_{Al_2(SO_4)_3}=\dfrac{0,1.342}{200+5,4-0,3.2}.100\%=16,7\%\\ c,m_{Al_2(SO_4)_3}=0,1.342=34,2(g)\)
Câu 37:
\((1)2Al(OH)_3\xrightarrow{t^o}Al_2O_3+3H_2O\\ (2)Al_2O_3+3H_2SO_4\to Al_2(SO_4)_3+3H_2O\\ (3)Al_2(SO_4)_3+3BaCl_2\to 3BaSO_4\downarrow+2AlCl_3\)
Chọn A
\(n_{CuO}=\dfrac{1.6}{80}=0.02\left(mol\right)\)
\(CuO+H_2SO_4\rightarrow CuSO_4+H_2O\)
\(0.02.......0.02.................0.02\)
\(m_{H_2SO_4}=0.02\cdot98=1.96\left(g\right)\)
\(m_{dd_{H_2SO_4}}=\dfrac{1.96}{20\%}=9.8\left(g\right)\)
\(m_{\text{dung dịch sau phản ứng }}=1.6+9.8=11.4\left(g\right)\)
\(C\%_{CuSO_4}=\dfrac{0.02\cdot160}{11.4}=28.07\%\)
mH2SO4 = 9,8%.200=19,6(g) -> nH2SO4=0,2(mol)
nAl=0,1(mol)
PTHH: 2Al +3 H2SO4 -> Al2(SO4)3 + 3H2
Ta có: 0,1/2 < 0,2/3 => H2SO4 dư, Al hết, tính heo nAl
nAl2(SO4)3=mAl/2=0,1/2=0,05(mol)
mAl2(SO4)3 (LT)= 0,05.342=17,1(g)
Vì: H=75%
=>mAl2(SO4)3 (TT)=75%. 17,1=12,825(g)
a) Đặt: nZn=x(mol); nFe= y(mol) (x,y: nguyên, dương)
Zn + H2SO4 -> ZnSO4 + H2
x_______x_______x________x
Fe + H2SO4 -> FeSO4 + H2
y____y_________y___y(mol)
b) m(rắn)=mCu=3(g)
=> m(Zn, Fe)= 21,6 - 3= 18,6(g)
Ta có hpt:
\(\left\{{}\begin{matrix}65x+56y=18,6\\22,4x+22,4y=6,72\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=0,2\\y=0,1\end{matrix}\right.\)
=> Zn= 65.0,2=13(g)
=>%mZn= (13/21,6).100=60,185%
%mCu=(3/21,6).100=13,889%
=>%mFe=25,926%
c) nH2SO4=x+y=0,3(mol) =>mH2SO4=29,4(g)
=> mddH2SO4= (29,4.100)/25=117,6(g)
\(a,2Fe+3Cl_2\xrightarrow{t^o}2FeCl_3\\ FeCl_3+3NaOH\to Fe(OH)_3\downarrow+3NaCl\\ 2Fe(OH)_3+3H_2SO_4\to Fe_2(SO_4)_3+6H_2O\\ Fe_2(SO_4)_3+3Zn\to 3ZnSO_4+2Fe\\ Fe+2HCl\to FeCl_2+H_2\\ b,4Al+3O_2\xrightarrow{t^o}2Al_2O_3\\ Al_2O_3\xrightarrow[cryolit]{đpnc}4Al+3O_2\\ 2Al+3H_2SO_4\to Al_2(SO_4)_3+3H_2\\ Al_2(SO_4)_3+6NaOH\to 2Al(OH)_3\downarrow+3Na_2SO_4\\ 2Al(OH)_3\xrightarrow{t^o}Al_2O_3+3H_2O\)
a) $Al_2O_3 + 3H_2SO_4 \to Al_2(SO_4)_3 + 3H_2O$
b) $n_{Al_2O_3} = \dfrac{10,2}{102} = 0,1(mol)$
Theo PTHH :
$n_{H_2SO_4} = 3n_{Al_2O_3} = 0,3(mol)$
Gọi $m_{dd\ H_2SO_4} = a(gam)$
$\Rightarrow m_{dd\ sau\ pư} = a + 10,2(gam)$
$C\%_{Al_2(SO_4)_3} = \dfrac{0,1.342}{a + 10,2}.100\% = \dfrac{34,2}{a + 10,2}.100\%$
\(n_{Al_2O_3}=\dfrac{10.2}{10,2}=0,1mol\)
\(Al_2O_3+3H_2SO_4->Al_2\left(SO_4\right)_3+3H_2O\)
Chưa đủ dữ kiện tính \(C\%_{Al_2\left(SO_4\right)_3}\) vì chưa có khối lượng dd sulfuric acid.