a) PTHH : \(2Al+6HCl-->2AlCl_3+3H_2\)  (1)

                 \(Fe+2HCl-->FeCl_2+H_2\)  (2)

                  \(H_2+CuO-t^o->Cu+H_2O\)   (3)

b) Ta có : \(m_{CR\left(giảm\right)}=m_{O\left(lay.di\right)}\)

=> \(m_{O\left(lay.di\right)}=32-26,88=5,12\left(g\right)\)

=> \(n_{O\left(lay.di\right)}=\frac{5,12}{16}=0,32\left(mol\right)\)

Theo pthh (3) : \(n_{H_2\left(pứ\right)}=n_{O\left(lay.di\right)}=0,32\left(mol\right)\)

=> \(tổng.n_{H_2}=\frac{0,32}{80}\cdot100=0,4\left(mol\right)\)

Đặt \(\hept{\begin{cases}n_{Al}=a\left(mol\right)\\n_{Fe}=b\left(mol\right)\end{cases}}\) => \(27a+56b=11\left(I\right)\)

Theo pthh (1) và (2) :  \(n_{H_2\left(1\right)}=\frac{3}{2}n_{Al}=\frac{3}{2}a\left(mol\right)\)

                                     \(n_{H_2\left(2\right)}=n_{Fe}=b\left(mol\right)\)

=> \(\frac{3}{2}a+b=0,4\left(II\right)\)

Từ (I) và (II) => \(\hept{\begin{cases}a=0,2\\b=0,1\end{cases}}\)

=> \(\hept{\begin{cases}m_{Al}=27\cdot0,2=5,4\left(g\right)\\m_{Fe}=56\cdot0,1=5,6\left(g\right)\end{cases}}\)

\(n_{H_2\left(bđ\right)}=\dfrac{1.344}{22.4}=0.06\left(mol\right)\)

\(n_{H_2\left(dư\right)}=\dfrac{0.448}{22.4}=0.02\left(mol\right)\)

\(\Rightarrow n_{H_2\left(pư\right)}=0.06-0.02=0.04\left(mol\right)\)

\(CuO+H_2\underrightarrow{^{^{t^0}}}Cu+H_2O\)

\(.......0.04..0.04\)

\(m_{Cu}=0.04\cdot64=2.56\left(g\right)\)

\(2NaCl+2H_2O\underrightarrow{^{^{dpcmn}}}2NaOH+2H_2+Cl_2\)

\(0.04...........................................0.04\)

\(m_{NaCl}=0.04\cdot58.5=2.34\left(g\right)\)

nH2 = 6,72/22,4 = 0,3 (mol)

nCuO = 8/80 = 0,1 (mol)

PTHH: CuO + H2 -> (t°) Cu + H2O

LTL: 0,1 < 0,3 => H2 dư

nCu = nH2O = nCuO = 0,1 (mol)

mCu = 0,1 . 64 = 6,4 (g)

Số phân tử H2O: 0,1 . 6.10^23 = 0,6.10^23 (phân tử)

a. \(n_{H_2}=\dfrac{6.72}{22,4}=0,3\left(mol\right)\)

\(n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\)

PTHH : CuO + H₂ -t^o-> Cu + H₂O

             0,1                   0,1      0,1

Xét tỉ lệ : 0,3 > 0,1 => H₂ dư , CuO đủ

b. \(m_{Cu}=0,1.64=6,4\left(g\right)\)

c. \(A=n.N=0,1.6.10^{23}=0,6.10^{23}\) phân tử 

H₂+CuO-to>Cu+H₂O

        0,1-------0,1----0,1

n H2=\(\dfrac{6,72}{22,4}\)=0,3 mol

n CuO=\(\dfrac{8}{80}\)=0,1 mol

=>H2 dư

=>m Cu=0,1.64=6,4g

=>soospt H2O= 0,1.6.10²³=6.10²²pt

a, \(n_{H_2}=\dfrac{3,7185}{24,79}=0,15\left(mol\right)\)

PT: \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)

Theo PT: \(n_{Fe}=n_{H_2}=0,15\left(mol\right)\Rightarrow m_{Fe}=0,15.56=8,4\left(g\right)\)

b, Theo PT: \(n_{FeSO_4}=n_{H_2}=0,15\left(mol\right)\Rightarrow m_{FeSO_4}=0,15.152=22,8\left(g\right)\)

c, \(n_{CuO}=\dfrac{24}{80}=0,3\left(mol\right)\)

PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)

Xét tỉ lệ: \(\dfrac{0,3}{1}>\dfrac{0,15}{1}\), ta được CuO dư.

Theo PT: \(n_{Cu}=n_{CuO\left(pư\right)}=n_{H_2}=0,15\left(mol\right)\)

\(\Rightarrow n_{CuO\left(dư\right)}=0,3-0,15=0,15\left(mol\right)\)

Chất rắn thu được sau pư gồm Cu và CuO dư.

⇒ m _{chất rắn} = m_Cu + m_{CuO (dư)} = 0,15.64 + 0,15.80 = 21,6 (g)

a, Gọi \(\left\{{}\begin{matrix}n_{Al}=a\left(mol\right)\\n_{Mg}=b\left(mol\right)\end{matrix}\right.\)

\(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)

PTHH:

2Al + 3H₂SO₄ ---> Al₂(SO₄)₃ + 3H₂

a---->1,5a--------------------------->1,5a

Mg + H₂SO₄ ---> MgSO₄ + H₂

b------>b----------------------->b

Hệ pt \(\left\{{}\begin{matrix}27a+24b=6,3\\1,5a+b=0,3\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,1\left(mol\right)\\b=0,15\left(mol\right)\end{matrix}\right.\)

\(\rightarrow\left\{{}\begin{matrix}m_{Al}=0,1.27=2,7\left(g\right)\\m_{Mg}=0,15.24=3,6\left(g\right)\end{matrix}\right.\\ \rightarrow\left\{{}\begin{matrix}\%m_{Al}=\dfrac{2,7}{6,3}=42,86\%\\\%m_{Mg}=100\%-42,86\%=57,14\%\end{matrix}\right.\)

b, \(n_{H_2SO_4}=0,1.1,5+0,15=0,3\left(mol\right)\)

\(\rightarrow V_{ddH_2SO_4}=\dfrac{0,3}{0,5}=0,6\left(l\right)=600\left(ml\right)\)

c, đề yêu cầu jv?

46,4 g oxit nào

46,4 gam gì vậy bạn ( câu b ý )

Câu c chất rắn là gì vậy bạn?