a) Phản ứng

CuO   +   H 2   → t o   Cu   +   H 2 O (1)

(mol) 0,3          0,3 ← 0,3

b) Ta có: n Cu = 19,2/64 = 0,3 (mol)

Từ (1) →  n Cu  = 0,3 (mol) → m CuO = 0,3 x 80 = 24 (gam)

Và n H 2 = 0,3 (mol) → V H 2 =0,3 x 22,4 = 6,72 (lít)

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

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

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

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

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

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

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

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

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

Chữ đẹp

PT: CuO + H₂ ---> Cu + H₂O

a. Ta có: \(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)

Theo PT: n_Cu = \(n_{H_2}=0,3\left(mol\right)\)

=> m_Cu = 0,3 . 64 = 19,2(g)

Theo PT: \(n_{H_2O}=n_{Cu}=0,3\left(mol\right)\)

=> \(m_{H_2O}=0,3.18=5,4\left(g\right)\)

b. Theo PT: n_CuO = n_Cu = 0,3(mol)

=> m_CuO = 0,3 . 80 = 24(g)

H2+CuO->Cu+H2O

0,3--0,3----0,3----0,3 mol

n H2=6,72\22,4=0,3 mol

=>m Cu=0,3.64=19,2g

=>m H2O=ơ0,3.18=5,4g

=>m CuO=0,3.80=24g

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

b, \(n_{H_2}=\dfrac{2,479}{24,79}=0,1\left(mol\right)\)

\(n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\)

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

Theo PT: \(n_{H_2O}=n_{H_2}=0,1\left(mol\right)\Rightarrow m_{H_2O}=0,1.18=1,8\left(g\right)\)

c, BTKL, có: m_H2 + m_CuO = m _{chất rắn} + m_H2O

⇒ a = 0,1.2 + 12 - 1,8 = 10,4 (g)

a) nAl=0,2(mol)

PTHH: 2 Al + 6 HCl ->  2 AlCl3 +  3 H2

H2 + CuO -to-> Cu + H2O

nAlCl3= nAl= 0,2(mol)

=> mAlCl3= 133,5. 0,2= 26,7(g)

b) nCu= nH2= 3/2 . 0,2=0,3(mol)

=> mCu= 0,3.64=19,2(g)

(Qua phản ứng nghe kì á, chắc tạo thành chứ ha)

<3

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

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

nMg = 4.8/24 = 0.2 (mol) 

Mg + 2HCl => MgCl2 + H2 

0.2.................................0.2

CuO + H2 -to-> Cu + H2O 

...........0.2..........0.2

mCu = 0.2*64 = 12.8 (g) 

a) PTHH: Mg +  2HCl -> MgCl2 + H2

0,2____________0,4___0,2___0,2(mol)

CuO + H2 -to-> Cu + H2O

0,2___0,2____0,2(mol)

b) =>mCu=0,2.64=12,8(g)

\(n_{Fe}=\dfrac{2.8}{56}=0.05\left(mol\right)\)

\(Fe+2HCl\rightarrow FeCl_2+H_2\)

\(0.05................................0.05\)

\(V_{H_2}=0.05\cdot22.4=1.12\left(l\right)\)

\(n_{CuO}=\dfrac{6}{80}=0.075\left(mol\right)\)

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

\(1............1\)

\(0.075......0.05\)

Chất khử : H₂ . Chất OXH : CuO 

\(LTL:\dfrac{0.075}{1}>\dfrac{0.05}{1}\Rightarrow CuOdư\)

\(m_{CuO\left(dư\right)}=\left(0.075-0.05\right)\cdot64=1.6\left(g\right)\)