2Al + 6HCl \(\rightarrow\) 2AlCl₃ + 3H₂ (1)
Fe + 2HCl \(\rightarrow\) FeCl₂ + H₂ (2)
Giả sử khối lượng của dung dịch là 100g
=> m_HCl = 7,3g => n_HCl = \(\dfrac{7,3}{36,5}=0,2\left(mol\right)\)
Ta có: \(\dfrac{m_{FeCl2}}{100}.100=3,093\) => m_FeCl2 = 3,093 (g)
=> nFeCl2 = \(\dfrac{3,093}{127}=0,02\)(mol)
Theo PT(2): n_HCl = 2n_FeCl2 = 0,04 (mol)
=> nHCl(1) = 0,2-0,04=0,16 (mol)
Theo PT(1): nAlCl3 = \(\dfrac{0,16}{3}\) (mol)
=> mAlCl3 =\(\dfrac{0,16}{3}\).133,5=7,12(g) 
=> C%AlCl3 = \(\dfrac{7,12}{100}\).100=7,12%
 

\(n_{CuSO4}=\dfrac{16\%.50}{100\%.160}=0,05\left(mol\right)\)

Pt : \(CuSO_4+2NaOH\rightarrow Cu\left(OH\right)_2+Na_2SO_4\)

       0,05-------->0,1---------->0,05--------->0,05

a) \(C\%_{ddNaOH}=\dfrac{0,1.40}{250}.100\%=1,6\%\)

b) \(m_{ddspu}=50+250-0,05.98=295,1\left(g\right)\)

\(C\%_{Na2SO4}=\dfrac{0,05.142}{295,1}.100\%=2,41\%\)

\(n_{CuSO_4}=\dfrac{m_{dd}\cdot C\%}{100\cdot M}=\dfrac{50\cdot16\%}{100\cdot\left(64+32+16\cdot4\right)}=0,05\left(mol\right)\)

\(PTHH:CuSO_4+2NaOH\rightarrow Cu\left(OH\right)_2+Na_2SO_4\)

                     1                  2                    1                    1

                   0,05              0,1                 0,05               0,05 (mol)

\(a)C\%_{NaOH}=\dfrac{n\cdot100\cdot M}{m_{dd}}=\dfrac{01\cdot100\cdot\left(23+16+1\right)}{250}=1,6\%\)

\(b)m_{dd-sau-pư}=m_{dd_đ}+m_{ct_đ}-m\downarrow-m\uparrow\)

\(=50+250-\left(0,05\cdot23+32+16\cdot4\right)=294,05\left(g\right)\)

\(C\%_{Na_2SO_4}=\dfrac{n\cdot100\cdot M}{m_{dd}}=\dfrac{0,05\cdot100\cdot\left(23\cdot2+32+16\cdot4\right)}{294,05}\approx2,41\%.\)

nCuSO4​=100%.16016%.50​=0,05(mol)

Pt : ����4+2����→��(��)2+��2��4CuSO4​+2NaOH→Cu(OH)2​+Na2​SO4​

       0,05-------->0,1---------->0,05--------->0,05

a) �%������=0,1.40250.100%=1,6%C%ddNaOH​=2500,1.40​.100%=1,6%

b) ������=50+250−0,05.98=295,1(�)mddspu​=50+250−0,05.98=295,1(g)

�%��2��4=0,05.142295,1.100%=2,41%C%Na2SO4​=295,10,05.142​.100%=2,41%

a, PT: \(Mg+2HCl\rightarrow MgCl_2+H_2\)

\(MgCl_2+2NaOH\rightarrow2NaCl+Mg\left(OH\right)_{2\downarrow}\)

\(Mg\left(OH\right)_2\underrightarrow{t^o}MgO+H_2O\)

b, Ta có: \(n_{Mg}=\dfrac{9,6}{24}=0,4\left(mol\right)\)

Theo PT: \(n_{HCl}=2n_{Mg}=0,8\left(mol\right)\)

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

c, Theo PT: \(n_{MgO}=n_{Mg}=0,4\left(mol\right)\)

\(\Rightarrow m_{MgO}=0,4.40=16\left(g\right)\)

a, \(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)

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

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

b, \(n_{Na_2O}=\dfrac{6,2}{62}=0,1\left(mol\right)\)

\(Na_2O+H_2O\rightarrow2NaOH\)

\(n_{NaOH}=2n_{Na_2O}=0,2\left(mol\right)\Rightarrow C_{M_{NaOH}}=\dfrac{0,2}{0,5}=0,4\left(M\right)\)

\(a,n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)

PTHH: 

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

0,15    0,3           0,15      0,15

\(m_{Fe}=0,15.56=8,4\left(g\right)\)

\(a,n_{Na_2O}=\dfrac{6,2}{62}=0,1\left(mol\right)\)

PTHH :

\(Na_2O+H_2O\rightarrow2NaOH\)

0,1           0,1        0,2

\(C_{M\left(A\right)}=\dfrac{0,2}{0,5}=0,4\left(M\right)\)

n_Fe=m/M=11,2/56=0,2(mol)

PT:

Fe + 2HCl -> FeCl₂ + H₂\(\uparrow\)

1........2............1...........1 (mol)

0,2->0,4 -> 0,2 -> 0,2 (mol)

V_H2=n.22,4=0,2.22,4=4,48(lít)

b) m_FeCl2=n.M=0,2.127=25,4(g)

c) m_{d d thu được sau phản ứng} = m_Fe + m_HCl - m_H2=11,2+200- (0,2.2)=210,8(g)

=> \(C\%_{ddthuduocsauphanung}=\dfrac{m_{FeCl_2}.100\%}{m_{ddsauphanung}}=\dfrac{25,4.100}{210,8}\approx12,049\left(\%\right)\)

d)

PT:

HCl + NaOH -> H₂O + NaCl

1............1..............1..............1 (mol)

0,4 -> 0,4 -> 0,4 -> 0,4 (mol)

m_NaCl=n.M=0,4.58,5=23,4(g)

m_{d d sau phản ứng} = m_HCl + m_NaOH=200+150=350(g)

C%_{d d sau phản ứng}=\(\dfrac{m_{NaCl}.100\%}{m_{ddsauphanung}}=\dfrac{23,4.100}{350}\approx6,7\left(\%\right)\)

Chúc bạn học tốt

a, Fe + 2HCl -> FeCl₂ + H₂

n_Fe= 11,2/56=0,2(mol)

n_HCl = 200/36,5\(\approx5,48\left(mol\right)\)

Vì 0,2<5,48/2=> Fe hết , tính theo số mol Fe

Theo PTHH , n_H2 = n_Fe = 0,2 . 22,4 =4,48(l)

b , Theo PTHH , n_FeCl2= 0,2 (m0l)=> m=25,4(g)

c, m_{dung dịch trước phản ứng} = 11,2+200 = 211,2(g)

C% = 25,4/211,2 . 100% \(\approx12,03\%\)

d, NaOH + HCl -> NaCl + H₂O

n_NaOH = 150/40=3,75 (mol)

=> NaOH pư hết

n_NaCl= 3,75(mol)

c% = \(\dfrac{3,75\left(23+35,5\right)}{200+150}.100\%=?\)

...........

còn lại bạn làm tiếp nhé , bây h mik bận lắm

Gọi \(n_{Fe}=x\left(mol\right)\)\(;n_{Zn}=y\left(mol\right)\)

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

Ta có:  \(\left\{{}\begin{matrix}56x+65y=18,6\\2x+2y=2n_{H_2}=0,6\end{matrix}\right.\)\(\Rightarrow\left\{{}\begin{matrix}x=0,1\\y=0,2\end{matrix}\right.\)

\(\%m_{Fe}=\dfrac{0,1\cdot56}{18,6}\cdot100\%=30,11\%\)

\(\%m_{Zn}=100\%-30,11\%=69,89\%\)

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

0,1     0,2

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

0,2     0,4

\(n_{HCl}=0,2+0,4=0,6mol\)

\(C_M=\dfrac{n}{V}=\dfrac{0,6}{0,2}=3M\)

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