PT: \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)

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

Theo PT: \(\left\{{}\begin{matrix}n_{Al\left(LT\right)}=\dfrac{2}{3}n_{H_2}=0,2\left(mol\right)\\n_{HCl\left(LT\right)}=2n_{H_2}=0,6\left(mol\right)\end{matrix}\right.\)

Mà: H% = 80%

\(\Rightarrow\left\{{}\begin{matrix}n_{Al\left(TT\right)}=\dfrac{0,2}{80\%}=0,25\left(mol\right)\\n_{HCl\left(TT\right)}=\dfrac{0,6}{80\%}=0,75\left(mol\right)\end{matrix}\right.\)

⇒ m_Al = 0,25.27 = 6,75 (g)

m_HCl = 0,75.36,5 = 27,375 (g)

a+b+c) PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)

Ta có: \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)=n_{ZnCl_2}=n_{H_2}\)

\(\Rightarrow\left\{{}\begin{matrix}m_{ZnCl_2}=0,1\cdot136=13,6\left(g\right)\\V_{H_2}=0,1\cdot22,4=2,24\left(l\right)\end{matrix}\right.\)

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

Theo PTHH: \(n_{H_2}=n_{Cu}=0,1\left(mol\right)\)

\(\Rightarrow m_{Cu}=0,1\cdot64=6,4\left(g\right)\)

a, PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)

b, Ta có: \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)

Theo PT: \(n_{ZnCl_2}=n_{H_2}=n_{Zn}=0,1\left(mol\right)\)

\(\Rightarrow n_{H_2}=0,1.22,4=2,24\left(l\right)\)

c, Ta có: \(m_{ZnCl_2}=0,1.136=13,6\left(g\right)\)

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

Theo PT: \(n_{Cu}=n_{H_2}=0,1\left(mol\right)\)

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

Bạn tham khảo nhé!

a, \(Fe+2HCl\rightarrow FeCl_2+H_2\)

Ta có: \(n_{H_2}=\dfrac{9,916}{24,79}=0,4\left(mol\right)\)

b, \(n_{FeCl_2}=n_{H_2}=0,4\left(mol\right)\)

\(\Rightarrow m_{FeCl_2}=0,4.127=50,8\left(g\right)\)

c, \(n_{HCl}=2n_{H_2}=0,8\left(mol\right)\)

\(\Rightarrow C_{M_{HCl}}=\dfrac{0,8}{0,2}=4\left(M\right)\)

Zn+2HCl->ZnCl2+H2

0,2---0,4---0,2--------0,2

n H2=\(\dfrac{4,48}{22,4}=0,2mol\)

=>m Zn=0,2.65=13g

=>m HCl=0,4.36,5=14,6g

=>m ZnCl2=0,2.136=27,2g

a) PTHH: Zn + 2HCl -> ZnCl₂ + H₂

Ta có: 

nH2 = 4,48:22,4=0,2(mol) 
pthh: Zn+2HCl---> ZnCl2+H2 
          0,2<----0,4<-------0,2  <--0,2 (mol)
mZn = 0,2 . 65= 13 (g)
mHCl = 0,2.36,5=7,3(g)
c) mZnCl2 = 0,2 . 136 =27,2 (g)

n_Zn  = 6,5 : 65 = 0,1 (mol) 
pthh: Zn+2HCl -> ZnCl₂ + H2 
        0,1   0,1                      0,1
=> m_HCl  = 0,1 . 36,5 = 3,65(g) 
pthh : CuO + H₂ -to-> Cu + H₂O 
                     0,1          0,1 
=> m_Cu  = 0,1 . 64 = 6,4 (g) 
 

1/ nNaCl=5,85/58,5=0,1 mol. 
nAgNO3=34/170=0,2 mol. 
PTPU: NaCl+AgNO3=>AgCl+NaNO3 
vì NaCl và AgNO3 phan ung theo ti le 1:1 (nAgNO3 p.u=nNaCl=0,1 mol) 
=>AgNO3 du 
nAgNO3 du= 0,2-0,1=0,1 mol. 
Ta tinh luong san pham theo chat p.u het la NaCl 
sau p.u co: AgNO3 du:0,1 mol; AgCl ket tua va NaCl: nAgCl=nNaNO3=nNaCl=0,1 mol.V(dd)=300+200=500ml=0,5 ()l 
=>khoi lg ket tua: mAgCl=0,1.143,5=14,35 g 
C(M)AgNO3=C(M)NaNO3=n/V=0,1/0,5=0,2 M

\(m_{O_2}=44.6-28.6=16\left(g\right)\)

\(n_{O_2}=\dfrac{16}{32}=0.5\left(mol\right)\)

\(n_{HCl}=2n_{H_2O}=4n_{O_2}=0.5\cdot4=2\left(mol\right)\)

\(m_{Muối}=m_{Kl}+m_{Cl-}=28.6+2\cdot35.5=99.6\left(g\right)\)

2Na + 2H2O \(\rightarrow\) 2NaOH + H2

0,4___________0,4______0,2

NaOH + HCl\(\rightarrow\) NaCl + H2O

0,4_____0,4____0,4

nNaCl= 0,4 (mol)

\(\rightarrow\) mNa= 9,2 (g)

mdd sau phản ứng= 9,2 + 100 - (0,2 . 2)=108,8 (g)

mNaOH= 16(g)

\(\rightarrow\) C%NaOH = \(\frac{16}{108,8}\).100= 14,7%

mddHCl=\(\frac{\text{0,4.36,5.100}}{10}\)=146 (g)