\(n_{CO_2}=\dfrac{0,896}{22,4}=0,04(mol)\\ a,MgCO_3+2HCl\to MgCl_2+H_2O+CO_2\uparrow\\ \Rightarrow n_{MgCO_3}=0,04(mol)\\ b,m_{MgCO_3}=0,04.84=3,36(g)\\ m_{MgSO_4}=12-3,36=8,64(g)\\ c,n_{HCl}=0,08(mol)\\ \Rightarrow C_{M_{HCl}}=\dfrac{0,08}{0,2}=0,016M\)

a) MgCO₃ + 2HCl --> MgCl₂ + CO₂ + H₂O

b) \(n_{CO_2}=\dfrac{0,896}{22,4}=0,04\left(mol\right)\)

PTHH: MgCO₃ + 2HCl --> MgCl₂ + CO₂ + H₂O

______0,04<------0,08<---------------0,04

=> m_MgCO3 = 0,04.84 = 3,36(g)

m_MgSO4 = 12-3,36 = 8,64(g)

c) \(C_M=\dfrac{0,08}{0,2}=0,4M\)

a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)

b, \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)

Theo PT: \(n_{H_2}=n_{Zn}=0,2\left(mol\right)\Rightarrow V_{H_2}=0,2.22,4=4,48\left(l\right)\)

c, \(n_{ZnCl_2}=n_{Zn}=0,2\left(mol\right)\Rightarrow m_{ZnCl_2}=0,2.136=27,2\left(g\right)\)

d, \(n_{HCl}=2n_{Zn}=0,4\left(mol\right)\Rightarrow m_{HCl}=0,4.36,5=14,6\left(g\right)\)

\(\Rightarrow m_{ddHCl}=\dfrac{14,6}{7,3\%}=200\left(g\right)\)

⇒ m _{dd sau pư} = 13 + 200 - 0,2.2 = 212,6 (g)

\(\Rightarrow C\%_{ZnCl_2}=\dfrac{27,2}{212,6}.100\%\approx12,79\%\)

`a)PTHH: Zn + 2HCl -> ZnCl_2 + H_2↑`

____________________________________

`b) n_[Zn] = [ 6,5 ] / 65 = 0,1 (mol)`

Theo `PTHH` có: `n_[H_2] = n_[Zn] = 0,1 (mol)`

        `-> V_[H_2 (đktc)] = 0,1 . 22,4 = 2,24 (l)`

______________________________________

`c)` Theo `PTHH` có: `n_[HCl] = 2 n_[Zn] = 2 . 0,1 = 0,2 (mol)`

  Đổi `200 ml = 0,2 l`

     `-> C_[M_[HCl]] = [ 0,2 ] / [0,2 ] = 1(M)`

________________________________________

`d)` Theo `PTHH` có: `n_[ZnCl_2] = n_[Zn] = 0,1 (mol)`

     `-> m_[ZnCl_2] = 0,1 . 136 = 13,6 (g)`

VHCl= 200ml = 0,2 (l)

Zn + 2HCl -- > ZnCl2 + H2

nZn = 6,5 : 65 = 0,1(mol)

VH2 = 0,1 . 22,4 = 2,24 (l)

\(C_{MHCl}=\dfrac{n}{V}=\dfrac{0,2}{0,2}=1M\)

mZnCl2 = 0,1 . 136 = 13,6 (g)

nZn = \(\frac{6,5}{65}=0,1\) mol

a/ PTHH : Zn + 2HCl -----> ZnCl2 + H2

                   1                                           1

                  0,1                                       0,1

=> V_H2 = 0,1 x 22,4 = 2,24 (l)

c/ nHCl = 2nZn = 0,2 mol

\(\Rightarrow C_{M_{HCl}}=\frac{0,2}{\frac{100}{1000}}=2M\)

d/\(n_{HCl}\) trong 500ml dd HCl là : \(2\times0,5=1\left(mol\right)\)

PTHH : 2HCl + Ca(OH)₂ -----> CaCl₂ + 2H₂O

                  1             1

Suy ra \(V_{Ca\left(OH\right)_2}=\frac{n_{Ca\left(OH\right)_2}}{C_{M_{Ca\left(OH\right)_2}}}=\frac{1}{2}=0,5\left(l\right)\)

a) 

\(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)

PTHH: Zn + 2HCl --> ZnCl₂ + H₂

            0,2-->0,4----->0,2--->0,2

=> V_H2 = 0,2.22,4 = 4,48 (l)

b) m_HCl = 0,4.36,5 = 14,6 (g)

=> \(m_{dd.HCl}=\dfrac{14,6.100}{7,3}=200\left(g\right)\)

c)

m_{dd sau pư} = 13 + 200 - 0,2.2 = 212,6 (g)

m_ZnCl2 = 0,2.136 = 27,2 (g)

=> \(C\%=\dfrac{27,2}{212,6}.100\%=12,8\%\)

\(a/n_{HCl}=0,3.2=0,6mol\\ 2Al+6HCl\rightarrow2AlCl_3+3H_2\)

0,2        0,6             0.2             0,3

\(V_{H_2}=0,2.22,4=4,48l\\ b/m_{Al}=0,2.27=5,4g\)

\(a) Zn + 2HCl \to ZnCl_2 + H_2\\ b) n_{H_2} = n_{Zn} = \dfrac{6,5}{65} = 0,1(mol)\\ V_{H_2} = 0,1.22,4 = 2,24(lít)\\ c) n_{HCl} = 2n_{Zn} = 0,2(mol)\\ \Rightarrow m_{dd\ HCl} = \dfrac{0,2.36,5}{3,75\%} = 194,67(gam)\\ d) n_{ZnCl_2} = n_{Zn} = 0,1(mol)\\ m_{ZnCl_2} = 0,1.136 = 13,6(gam)\)

giúp mik vs ạ

PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)

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

\(\Rightarrow\left\{{}\begin{matrix}n_{ZnCl_2}=n_{H_2}=0,1\left(mol\right)\\n_{HCl}=0,2\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}V_{H_2}=0,1\cdot22,4=2,24\left(l\right)\\m_{ddHCl}=\dfrac{0,2\cdot36,5}{7,3\%}=100\left(g\right)\\m_{ZnCl_2}=0,1\cdot136=13,6\left(g\right)\end{matrix}\right.\)

Gọi x,y lần lượt là số mol của Mg và Fe

\(PTHH:\\ Mg+2HCl\rightarrow MgCl_2+H_2\\ Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{HCl}=0,14\cdot1=0,14\left(mol\right)\\ \Rightarrow n_{HCl}=2x+2y=0,14;m_{hh}=24x+56y=1,69\\ \Rightarrow\left\{{}\begin{matrix}x=0,0696875\\y=0,0003125\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}m_{Mg}=24x=1,6725\left(g\right)\\m_{Fe}=56y=0,0157\left(g\right)\end{matrix}\right.\)

a)\(Mg+2HCl\rightarrow MgCl_2+H_2\)

   \(x\)          \(2x\)    

   \(Fe+2HCl\rightarrow FeCl_2+H_2\)

   \(y\)           \(2y\)

b)\(n_{HCl}=0,14\cdot1=0,14mol\)

   Ta có: \(\left\{{}\begin{matrix}24x+56y=1,69\\2x+2y=0,14\end{matrix}\right.\)\(\Rightarrow\left\{{}\begin{matrix}x=0,07\\y=3,125\cdot10^{-4}\end{matrix}\right.\)

  \(m_{Mg}=0,07\cdot24=1,68\left(g\right)\)

  \(m_{Fe}=3,125\cdot10^{-4}\cdot56=0,0175\left(g\right)\)