\(a.Mg+2HCl\rightarrow MgCl_2+H_2\\ b.n_{Mg}=\dfrac{4,8}{24}=0,2mol\\ Mg+2HCl\rightarrow MgCl_2+H_2\)

0,2        0,4            0,2           0,2

\(V_{H_2}=0,2.24,79=4,958l\\ c.m_{MgCl_2}=0,2.95=19g\\ d.C_{M_{HCl}}=\dfrac{0,4}{0,3}=\dfrac{4}{3}M\)

a, nMg=0,2(mol)

Mg+2HCl=>MgCl2+H2

b, nH2=nMg=0,2(mol)

=>VH2=4,958(l)

c,nMgCl2=nMg=0,2(mol)

=>mMgCl2=19(g)

d,nHCl=2nMg=0,4(mol)

=>cM(HCl)=0,75(M)

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)

\(a.n_{Fe}=\dfrac{8,4}{56}=0,15mol\)

\(Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{Fe}=n_{H_2}=n_{FeCl_2}=0,15mol\\ V_{H_2,đktc}=0,15.22,4=3,36l\\ V_{H_2,đkc}=0,15.24,79=3,7185l\\ b.n_{HCl}=0,15.2=0,3mol\\ C_{M_{HCl}}=\dfrac{0,3}{0,2}=1,5M\\ c.m_{FeCl_2}=0,15.127=19,05g\)

Zn+2HCl->ZnCl2+H2

0,5----1------0,5-----0,5

n Zn=0,5 mol

=>VH2=0,5.24,79=12,395l

=>m ZnCl2=0,5.136=68g

CuO+H2-to->Cu+H2O

0,5----0,5-------------0,5

=>m Cu=0,5.64=32g

\(n_{Zn}=\dfrac{13}{65}=0,2(mol)\\ a,Zn+2HCl\to ZnCl_2+H_2\\ \Rightarrow n_{H_2}=0,2(mol);n_{HCl}=0,4(mol)\\ b,m_{HCl}=0,4.36,5=14,6(g)\\ c,V_{H_2}=0,2.24,79=4,958(l)\)

\(n_{H_2SO_4}=1.0,2=0,2(mol)\\ H_2SO_4+BaCl_2\to BaSO_4\downarrow+2HCl\\ \Rightarrow n_{BaSO_4}=n_{BaCl_2}=0,2(mol)\\ a,m_{BaSO_4}=0,2.233=46,6(g)\\ b,V_{dd_{BaCl_2}}=\dfrac{0,2}{1,5}\approx 0,13(l)\\ c,n_{HCl}=0,4(mol)\\ \Rightarrow C_{M_{HCl}}=\dfrac{0,4}{0,2+0,13}\approx 1,21M\)

\(d,\) Dd sau p/ứ là HCl nên làm quỳ tím hóa đỏ

\(n_{H_2SO_4}=0,2.1=0,2\left(mol\right)\\ H_2SO_4+BaCl_2\rightarrow BaSO_4+2HCl\\ n_{BaCl_2}=n_{BaSO_4}=n_{H_2SO_4}=0,2\left(mol\right)\\ n_{HCl}=2.0,2=0,4\left(mol\right)\\ a,m_{\downarrow}=m_{BaSO_4}=0,2.233=46,6\left(g\right)\\ b,V_{\text{dd}BaCl_2}=\dfrac{0,2}{1,5}=\dfrac{2}{15}\left(l\right)\\ c,C_{M\text{dd}HCl}=\dfrac{0,4}{\dfrac{2}{15}+0,2}=1,2\left(M\right)\\ d,V\text{ì}.c\text{ó}.\text{dd}.HCl\Rightarrow Qu\text{ỳ}.ho\text{á}.\text{đ}\text{ỏ}\)

200ml = 0,2l

\(n_{H2SO4}=1.0,2=0,2\left(mol\right)\)

Pt : \(BaCl_2+H_2SO_4\rightarrow BaSO_4+2HCl|\)

           1           1                  1              2

          0,2        0,2               0,2           0,4

a) \(n_{BaSO4}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)

⇒ \(m_{BaSO4}=0,2.233=46,6\left(g\right)\)

b) \(n_{BaCl2}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)

\(V_{ddBaCl2}=\dfrac{0,2}{1,5}=\dfrac{2}{15}\left(l\right)=133,33\left(ml\right)\)

c) \(n_{HCl}=\dfrac{0,2.2}{1}=0,4\left(mol\right)\)

\(V_{ddspu}=0,2+\dfrac{2}{15}=\dfrac{1}{3}\left(l\right)\)

\(C_{M_{ddHCl}}=\dfrac{0,4}{\dfrac{1}{3}}=1,2\left(M\right)\)

d) Cho quỳ tím vào dung dịch sau phản ứng , quỳ tím hóa đỏ. Vì dung dịch thu được sau phản ứng có HCl là axit

 Chúc bạn học tốt

\(n_{HCl}=0,5.0,2=0,1\left(mol\right)\)

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

      0,05<--0,1----->0,05--->0,05

\(m_{Fe}=0,05.56=2,8\left(g\right)\)

\(m_{FeCl2}=0,05.127=6,35\left(g\right)\)

\(V_{H2\left(dktc\right)}=0,05.22,4=1,12\left(l\right)\)

\(V_{H2\left(dkc\right)}=0,05.24,79=1,2395\left(l\right)\)