Khối lượng muối  FeSO 4  tạo thành là : 0,01 x 152 = 1,52 (gam).

Thể tích khí hiđro sinh ra : 0,01 x 22,4 = 0,224 (lít).

a, PT: \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)

b, Ta có: \(n_{Fe}=\dfrac{19,6}{56}=0,35\left(mol\right)\)

Theo PT: \(n_{H_2}=n_{Fe}=0,35\left(mol\right)\Rightarrow V_{H_2}=0,35.22,4=7,84\left(l\right)\)

c, \(n_{H_2SO_4}=n_{Fe}=0,35\left(mol\right)\Rightarrow C_{M_{H_2SO_4}}=\dfrac{0,35}{0,2}=1,75\left(M\right)\)

d, \(n_{FeSO_4}=n_{Fe}=0,35\left(mol\right)\Rightarrow m_{FeSO_4}=0,35.152=53,2\left(g\right)\)

e, \(C_{M_{FeSO_4}}=\dfrac{0,35}{0,2}=1,75\left(M\right)\)

d, \(n_{H_2SO_4}=0,25.1,6=0,4\left(mol\right)\)

Xét tỉ lệ: \(\dfrac{n_{Fe}}{1}< \dfrac{n_{H_2SO_4}}{1}\), ta được H₂SO₄ dư.

Theo PT: \(n_{H_2SO_4\left(pư\right)}=n_{Fe}=0,35\left(mol\right)\)

\(\Rightarrow n_{H_2SO_4\left(dư\right)}=0,4-0,35=0,05\left(mol\right)\)

\(\Rightarrow m_{H_2SO_4\left(dư\right)}=0,05.98=4,9\left(g\right)\)

a) PTHH: \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\uparrow\)

b) Ta có: \(n_{Fe}=\dfrac{0,56}{56}=0,01\left(mol\right)=n_{FeSO_4}=n_{H_2}\)

\(\Rightarrow\left\{{}\begin{matrix}m_{FeSO_4}=0,01\cdot152=1,52\left(g\right)\\V_{H_2}=0,01\cdot22,4=0,224\left(l\right)\end{matrix}\right.\)

c) Theo PTHH: \(n_{Fe}=n_{H_2SO_4}=0,01\left(mol\right)\)

\(\Rightarrow m_{ddH_2SO_4}=\dfrac{0,01\cdot98}{19,6\%}=5\left(g\right)\)

Ta có: \(n_{Fe}=\dfrac{0,56}{56}=0,01\left(mol\right)\)

\(PTHH:H_2SO_4+Fe--->FeSO_4+H_2\)

a. Theo PT: \(n_{H_2SO_4}=n_{FeSO_4}=n_{H_2}=n_{Fe}=0,01\left(mol\right)\)

\(\Rightarrow m_{FeSO_4}=0,01.152=1,52\left(g\right)\)

\(V_{H_2}=0,01.22,4=0,224\left(lít\right)\)

b. Ta có: \(m_{H_2SO_4}=0,01.98=0,98\left(g\right)\)

Ta lại có: \(C_{\%_{H_2SO_4}}=\dfrac{0,98}{m_{dd_{H_2SO_4}}}.100\%=19,6\%\)

\(\Rightarrow m_{dd_{H_2SO_4}}=5\left(g\right)\)

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

PTHH: 2Al + 3H₂SO₄ --> Al₂(SO₄)₃ + 3H₂

______0,2---->0,3------------>0,1------>0,3______(mol)

=> V_H2 = 0,3.22,4= 6,72(l)

b) \(C_{M\left(H_2SO_4\right)}=\dfrac{0,3}{0,1}=3M\)

\(C_{M\left(Al_2\left(SO_4\right)_3\right)}=\dfrac{0,1}{0,1}=1M\)

Câu 3:

\(n_{H_2}=\dfrac{6,72}{22,4}=0,3(mol)\\ PTHH:Mg+2HCl\to MgCl_2+H_2\\ MgO+2HCl\to MgCl_2+H_2O\\ \Rightarrow n_{Mg}=n_{H_2}=0,3(mol)\\ \Rightarrow \%_{Mg}=\dfrac{0,3.24}{15,2}.100\%=47,37\%\\ \Rightarrow \%_{MgO}=100\%-47,37\%=52,63\%\)

\(n_{MgO}=\dfrac{15,2-0,3.24}{40}=0,2(mol)\\ \Rightarrow \Sigma n_{HCl}=0,3.2+0,2.2=1(mol)\\ \Rightarrow m_{dd_{HCl}}=\dfrac{1.36,5}{10\%}=365(g)\\ \Sigma n_{MgCl_2}=0,2+0,3=0,5(mol)\\ \Rightarrow C\%_{MgCl_2}=\dfrac{0,5.95}{15,2+365}.100\%=12,49\%\)

\(PTHH:Mg+2H_2SO_{4(đ)}\to MgSO_4+2H_2O+SO_2\uparrow\\ MgO+H_2SO_4\to MgSO_4+H_2O\\ \Rightarrow n_{SO_2}=n_{Mg}=0,3(mol)\\ \Rightarrow V_{SO_2}=0,3.22,4=6,72(l)\)

a, \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)

Ta có: \(n_{Fe}=\dfrac{0,56}{56}=0,01\left(mol\right)\)

Theo PT: \(n_{H_2SO_4}=n_{FeSO_4}=n_{H_2}=n_{Fe}=0,01\left(mol\right)\)

b, \(m_{FeSO_4}=0,01.152=1,52\left(g\right)\)

\(V_{H_2}=0,01.22,4=0,224\left(l\right)\)

c, \(m_{ddH_2SO_4}=\dfrac{0,01.98}{19,6\%}=5\left(g\right)\)

\(n_{Mg}=\dfrac{12}{24}=0,5\left(mol\right)\)

PT: \(Mg+H_2SO_4\rightarrow MgSO_4+H_2\)

a, \(n_{H_2}=n_{Mg}=0,5\left(mol\right)\)

\(\Rightarrow V_{H_2}=0,5.22,4=11,2\left(l\right)\)

b, \(n_{H_2SO_4}=n_{Mg}=0,5\left(mol\right)\)\(\Rightarrow C_{M_{H_2SO_4}}=\dfrac{0,5}{0,2}=2,5\left(M\right)\)

giup mk voi

\(a)n_{H_2}=\dfrac{2,24}{22,4}=0,1mol\\ Zn+H_2SO_4\rightarrow ZnSO_4+H_2\\ n_{H_2SO_4}=n_{ZnSO_4}=n_{H_2}=0,1mol\\ C_{M_{H_2SO_4}}=\dfrac{0,1}{0,2}=0,5M\\ b)m_{ZnSO_4}=0,1.161=16,1g\)