\(a.2Al+6HCl->2AlCl_3+3H_2\\ b.m_{AlCl_3}=\dfrac{1}{3}.0,1.0,6.133,5=2,67g\\ c.V_{H_2}=\dfrac{1}{2}.0,06.24,79=0,7437\left(L\right)\\ d.a=\dfrac{1}{3}.0,1.0,6.27=0,54g\)

Bài 14:

Ta có: \(n_{BaCO_3}=\dfrac{39,4}{197}=0,2\left(mol\right)\)

PT: \(BaCO_3+2HCl\rightarrow BaCl_2+CO_2+H_2O\)

a, \(n_{CO_2}=n_{BaCO_3}=0,2\left(mol\right)\Rightarrow V_{CO_2}=0,2.24,79=4,958\left(l\right)\)

b, Sửa đề: tính khối lượng dung dịch HCl → tính nồng độ % dd HCl.

 \(n_{HCl}=2n_{BaCO_3}=0,4\left(mol\right)\Rightarrow m_{ddHCl}=\dfrac{0,4.36,5}{100}.100\%=14,6\%\)

c, \(n_{BaCl_2}=n_{BaCO_3}=0,2\left(mol\right)\)

Ta có: m _{dd sau pư} = 39,4 + 100 - 0,2.44 = 130,6 (g)

\(\Rightarrow C\%_{BaCl_2}=\dfrac{0,2.208}{130,6}.100\%\approx31,85\%\)

Bài 12:

Ta có: \(n_{MgCO_3}=\dfrac{25,2}{84}=0,3\left(mol\right)\)

PT: \(MgCO_3+2HCl\rightarrow MgCl_2+CO_2+H_2O\)

a, Theo PT: \(n_{CO_2}=n_{MgCO_3}=0,3\left(mol\right)\)

\(\Rightarrow V_{CO_2}=0,3.24,79=7,437\left(l\right)\)

b, Ta có: m _{dd sau pư} = 25,2 + 200 - 0,3.44 = 212 (g)

Theo PT: \(n_{MgCl_2}=n_{MgCO_3}=0,3\left(mol\right)\)

\(\Rightarrow C\%_{MgCl_2}=\dfrac{0,3.95}{212}.100\%\approx13,44\%\)

Bài 13:

Ta có: \(n_{CaCO_3}=\dfrac{10}{100}=0,1\left(mol\right)\)

PT: \(CaCO_3+2HCl\rightarrow CaCl_2+CO_2+H_2O\)

1. \(n_{CO_2}=n_{CaCO_3}=0,1\left(mol\right)\) \(\Rightarrow V_{CO_2}=0,1.24,79=2,479\left(l\right)\)

2. \(n_{HCl}=2n_{CaCO_3}=0,2\left(mol\right)\Rightarrow m_{ddHCl}=\dfrac{0,2.36,5}{7,3\%}=100\left(g\right)\)

3. Ta có: m _{dd sau pư} = 10 + 100 - 0,1.44 = 105,6 (g)

Theo PT: \(n_{CaCl_2}=n_{CaCO_3}=0,1\left(mol\right)\)

\(\Rightarrow C\%_{CaCl_2}=\dfrac{0,1.111}{105,6}.100\%\approx10,51\%\)

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

PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)

_____0,2____0,4___________0,2 (mol)

\(\Rightarrow m_{HCl}=0,4.36,5=14,6\left(g\right)\)

b, \(V_{H_2}=0,2.24,79=4,958\left(l\right)\)

c, \(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)

____________0,2__2/15 (mol)

\(\Rightarrow m_{Fe}=\dfrac{2}{15}.56=\dfrac{112}{15}\left(g\right)\)

Số mol của 13 gam Zn:

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

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

            1     :   2      :     1      :      1 (g)

          0,2\(\rightarrow\) 0,4       :     0,2  :       0,2  (mol)

a,Khối lượng của 0,4 mol HCl:

\(m_{HCl}=n.M=0,4.36,5=14,6\left(g\right)\)

b, Thể tích khí H2:

\(V_{H_2}=n.24,79=0,2.24,79=4,958\left(l\right)\)

\(3H_2+Fe_2O_3\underrightarrow{t^o}2Fe+3H_2O\)

Khối lượng của \(\dfrac{2}{15}\) mol Fe:

\(n_{Fe}=\dfrac{m}{M}=\dfrac{2}{\dfrac{15}{56}}\approx7,5\left(g\right)\)

\(n_{HCl}=6\cdot0,05=0,3\left(mol\right)\\ a,PTHH:2Al+6HCl\rightarrow2AlCl_3+3H_2\)

Hiện tượng: Al tan dần, có bọt khí không màu xuất hiện

\(b,\left\{{}\begin{matrix}n_{Al}=\dfrac{1}{3}n_{HCl}=0,1\left(mol\right)\\n_{H_2}=\dfrac{1}{2}n_{HCl}=0,15\left(mol\right)\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}m_{Al}=0,1\cdot27=2,7\left(g\right)\\V_{H_2\left(đkc\right)}=0,15\cdot24,79=3,7185\left(l\right)\end{matrix}\right.\)

Thiếu đề ak bn

\(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\\ 2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\\ 0,2........0,3...........0,1...........0,3\left(mol\right)\\ a.C_{MddH_2SO_4}=\dfrac{0,3}{0,3}=1\left(M\right)\\ b.m_{Al_2\left(SO_4\right)_3}=342.0,1=34,2\left(g\right)\\ c.V_{H_2\left(đktc\right)}=0,3.22,4=6,72\left(l\right)\)

PTHH: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)

a) \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)

\(n_{H_2SO_4}=\dfrac{3}{2}n_{Al}=0,3\left(mol\right)\)

\(\Rightarrow C_{M_{H_2SO_4}}=\dfrac{0,3}{0,3}=1M\)

b) \(n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{2}n_{Al}=0,1\left(mol\right)\)

\(\Rightarrow m_{Al_2\left(SO_4\right)_3}=n.M=0,1.342=34,2\left(g\right)\)

c) \(n_{H_2}=n_{H_2SO_4}=0,3\left(mol\right)\)

\(\Rightarrow V_{H_2}=n.22,4=0,3.22,4=6,72\left(l\right)\)

t6 là hạn chót đúng ko ? sát deadline quá mà

a) Mg + 2HCl --> MgCl₂ + H₂

b) \(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)

PTHH: Mg + 2HCl --> MgCl₂ + H₂

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

=> m_HCl = 0,4.36,5 = 14,6 (g)

c) \(V_{H_2}=0,2.22,4=4,48\left(l\right)\)

d) 

PTHH: CuO + H₂ --t^o--> Cu + H₂O

                       0,2------->0,2

=> m_Cu = 0,2.64 = 12,8 (g)