\(a,n_{Mg}=\dfrac{2,4}{24}=0,1\left(mol\right)\\ PTHH:Mg+H_2SO_4\rightarrow MgSO_4+H_2\uparrow\left(1\right)\\ Theo.pt\left(1\right):n_{H_2}=n_{MgSO_4}=n_{Mg}=0,1\left(mol\right)\\ V_{H_2}=0,1.22,4=2,24\left(l\right)\\ m_{MgSO_4}=0,1.120=12\left(g\right)\\ b,PTHH:CuO+H_2\underrightarrow{t^o}Cu+H_2O\left(2\right)\\ Theo.pt\left(2\right):n_{Cu}=n_{H_2}=0,1\left(mol\right)\\ m_{Cu}=0,1.64=6,4\left(g\right)\)

\(n_{Mg}=\dfrac{2,4}{24}=0,1\left(mol\right)\)

PTHH :

\(Mg+H_2SO_4\rightarrow MgSO_4+H_2\uparrow\)

0,1        0,1             0,1             0,1 

\(a,m_{MgSO_4}=0,1.120=12\left(g\right)\)

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

\(c,m_{ddH_2SO_4}=\dfrac{0,1.98.100}{10}=98\left(g\right)\)

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

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

Theo PT: \(n_{H_2SO_4}=n_{MgSO_4}=n_{H_2}=m_{Mg}=0,2\left(mol\right)\)

a, \(m_{MgSO_4}=0,2.120=24\left(g\right)\)

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

c, Bạn bổ sung đề phần này nhé.

\(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\\ Mg+H_2SO_4\rightarrow MgSO_4+H_2\\ n_{MgSO_4}=n_{H_2}=n_{H_2SO_4}=n_{Mg}=0,2\left(mol\right)\\ a,m_{MgSO_4}=120.0,2=24\left(g\right)\\ b,V_{H_2\left(đkc\right)}=24,79.0,2=4,958\left(l\right)\\ c,Oxide:A_2O_x\left(x:hoá.trị.A\right)\\ A_2O_x+xH_2SO_4\rightarrow A_2\left(SO_4\right)_x+xH_2O\\ n_{Oxide}=\dfrac{\dfrac{3}{4}.0,2.1}{x}=\dfrac{0,15}{x}\left(mol\right)\\ M_{A_2O_x}=\dfrac{8}{\dfrac{0,15}{x}}=\dfrac{160}{3}x\)

Xét x=1;x=2;x=3;x=8/3 thấy x=3 (TM) khi đó KLR oxide là 160g/mol 

\(M_{M_2O_3}=2M_M+3.16=160\left(\dfrac{g}{mol}\right)\\ \Rightarrow M_M=\dfrac{160-48}{2}=56\left(\dfrac{g}{mol}\right)\)

Nên: M là sắt (Fe=56)

Oxide CTHH: Fe₂O₃

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

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

_____0,2_______0,2______0,2____0,2 (mol)

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

b, \(m_{MgSO_4}=0,2.120=24\left(g\right)\)

c, \(C_{M_{H_2SO_4}}=\dfrac{0,2}{0,1}=2\left(M\right)\)

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

Ta có: \(n_{H_2}=\dfrac{3,7185}{24,79}=0,15\left(mol\right)\)

a, \(n_{Al}=\dfrac{2}{3}n_{H_2}=0,1\left(mol\right)\Rightarrow m_{Al}=0,1.27=2,7\left(g\right)\)

b, \(n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{3}n_{H_2}=0,05\left(mol\right)\)

\(\Rightarrow m_{Al_2\left(SO_4\right)_3}=0,05.342=17,1\left(g\right)\)

c, \(n_{H_2SO_4}=n_{H_2}=0,15\left(mol\right)\)

\(\Rightarrow V_{H_2SO_4}=\dfrac{0,15}{1,5}=0,1\left(l\right)=100\left(ml\right)\)

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

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

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

a, Magnesium + Sulfuric acid → Magnesium sulfate + Hydrogen

b, BTKL: m_Mg + m_H2SO4 = m_MgSO4 + m_H2

c, Từ b, có: m_H2SO4 = m_MgSO4 + m_H2 - m_Mg = 27,2 + 0,4 - 13 = 14,6 (g)

\(a.\) magnesium+sulfuric acid→magnesium sulfate+hydrogen

\(b.m_{Mg}+m_{H_2SO_4}=m_{MgSO_4}+H_2\\ c.\left(b\right)\Leftrightarrow13+m_{H_2SO_4}=27,2+0,4\\ \Leftrightarrow m_{H_2SO_4}=14,6g\)

giup mink voi !!!

gap ah

 \(n_{Fe}=0,1\left(mol\right);n_{Cl_2}=0,12\left(mol\right)\)

\(2Fe+3Cl_2\rightarrow2FeCl_3\) (1)

Lập tỉ lệ : \(\dfrac{0,1}{2}>\dfrac{0,12}{3}\)

=> Sau phản ứng Fe dư

Hòa tan sản phẩm vào nước ta được:

2FeCl3 + Fe → 3FeCl2 (2)

b) Muối tạo thành là FeCl2 và FeCl3

\(n_{Fe\left(dư\right)}=0,1-0,12.\dfrac{2}{3}=0,02\left(mol\right)\)

\(n_{FeCl_2}=3n_{Fe\left(dư\right)}=0,06\left(mol\right)\)

Ta có : \(n_{FeCl_3}=n_{FeCl_3\left(1\right)}-n_{FeCl_3\left(2\right)}=0,12.\dfrac{2}{3}-0,02.2=0,04\left(mol\right)\)

\(m_{FeCl_2}=0,06.127=7,62\left(g\right)\)

\(m_{FeCl_3}=0,04.162,5=6,5\left(g\right)\)

c) \(CM_{FeCl_2}=\dfrac{0,06}{0,5}=0,12M\)

\(CM_{FeCl_3}=\dfrac{0,04}{0,5}=0,08M\)