Câu 1:

\(Mg+Br_2\rightarrow MgBr_2\\ n_{Br_2}=\dfrac{11,2}{160}=0,07\left(mol\right)=n_{Mg}=n_{MgBr_2}\\ a=m_{Mg}=0,07.24=1,68\left(g\right)\\ m_{MgBr_2}=184.0,07=12,88\left(g\right)\)

Mg+Br2->MgBr2

0,07--0,07----0,07

n Br2=\(\dfrac{11,2}{160}\)=0,07 mol

=>m Mg=0,07.24=1,68g

=>m MgBr2=0,07.184=12,88g

Câu 2:

\(n_{Al}=\dfrac{14,58}{27}=0,54\left(mol\right)\\ 2Al+3Cl_2\rightarrow\left(t^o\right)2AlCl_3\\ n_{AlCl_3}=n_{Al}=0,54\left(mol\right)\\ n_{Cl_2}=\dfrac{3}{2}.0,54=0,81\left(mol\right)\\ V_{Cl_2\left(đktc\right)}=0,81.22,4=18,144\left(l\right)\\ m_{AlCl_3}=0,54.133,5=72,09\left(g\right)\)

\(n_M=\dfrac{1,6}{M_M}\left(mol\right)\)

PTHH: M + Cl₂ --t^o--> MCl₂

____\(\dfrac{1,6}{M_M}\)----------->\(\dfrac{1,6}{M_M}\)

=> \(\dfrac{1,6}{M_M}\left(M_M+71\right)=4,44=>M_M=40\left(Ca\right)\)

\(n_{Ca}=\dfrac{1,6}{40}=0,04\left(mol\right)\)

PTHH: Ca + Cl₂ --t^o--> CaCl₂

_____0,04->0,04

=> V_Cl2 = 0,04.22,4 = 0,896(l)

Chọn A

\(n_{Cl_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)

Theo ĐLBTKL: m_R + m_Cl2 = m_RCln

=> m_R = 19 - 0,2.71 = 4,8(g)

PTHH: 2R + nCl₂ --t^o--> 2RCl_n

                    0,2---------->\(\dfrac{0,4}{n}\)

=> \(\dfrac{0,4}{n}\left(M_R+35,5n\right)=19\)

=> M_R = 12n (g/mol)

- Nếu n = 1 => L

- Nếu n = 2 => M_R = 24(Mg)

_k

Câu 1:

\(2Na+Br_2\rightarrow2NaBr\\ n_{NaBr}=\dfrac{61,8}{103}=0,6\left(mol\right)\\ n_{Na}=n_{NaBr}=0,6\left(mol\right)\\ n_{Br_2}=\dfrac{0,6}{2}=0,3\left(mol\right)\\ \Rightarrow a=m_{Na}=0,6.23=13,8\left(g\right)\\ m_{Br_2}=0,3.160=48\left(g\right)\\ m_{ddBr_2}=\dfrac{48}{5\%}=960\left(g\right)\)

Câu 2:

\(2Fe+3Cl_2\rightarrow\left(t^o\right)2FeCl_3\\ n_{FeCl_3}=\dfrac{40,625}{162,5}=0,25\left(mol\right)\\ n_{Fe}=n_{FeCl_3}=0,25\left(mol\right)\\ \Rightarrow m=m_{Fe}=0,25.56=14\left(g\right)\\ n_{Cl_2}=\dfrac{3}{2}.0,25=0,375\left(mol\right)\\ V_{Cl_2\left(đktc\right)}=0,375.22,4=8,4\left(l\right)\)

2Fe+3Cl₂-to>2FeCl₃

_{0,25------0,375------0,25 mol}

n _FeCl3=\(\dfrac{40,625}{162,5}\)=0,25 mol

=>m _Fe=0,25.56=14g

=>V _Cl2=0,375.22,4=8,4g

Gọi hóa trị của kim loại A là n

\(2A + nCl_2 \xrightarrow{t^o} 2ACl_n\)

Theo PTHH : 

\(n_A = n_{ACl_n}\)

⇔ \(\dfrac{9,2}{A} = \dfrac{23,4}{A+35,5n}\)

⇔ A = 23n

Với n = 1 thì A = 23(Na)

Vậy kim loai A là Natri.

Câu 2 : 

\(n_{Cu}=\dfrac{22,4}{64}=0,35\left(mol\right)\)

Pt : \(Cu+Cl_2\underrightarrow{t^o}CuCl_2|\)

         1         1            1

        0,35    0,35       0,35

 \(n_{CuCl2}=\dfrac{0,35.1}{1}=0,35\left(mol\right)\)

⇒ \(m_{CuCl2}=0,35.135=47,25\left(g\right)\)

\(n_{Cl2}=\dfrac{0,35.1}{1}=0,35\left(mol\right)\)

\(V_{Cl2\left(dtkc\right)}=0,35.22,4=7,84\left(l\right)\)

 Chúc bạn học tốt

\(Câu4\\ n_{Cl_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\\ 2Al+3Cl_2\rightarrow\left(t^o\right)2AlCl_3\\ n_{Al}=n_{AlCl_3}=\dfrac{2}{3}.0,15=0,1\left(mol\right)\\ \Rightarrow m=m_{Al}=0,1.27=2,7\left(g\right)\\ m_{AlCl_3}=133,5.0,1=13,35\left(g\right)\)

Câu 3:

\(n_{Br_2}=\dfrac{10,4}{160}=0,065\left(mol\right)\\ 2Na+Br_2\rightarrow2NaBr\\ n_{Na}=n_{NaBr}=0,065.2=0,13\left(mol\right)\\ a=m_{Na}=0,13.23=2,99\left(g\right)\\ m_{NaBr}=0,13.103=13,39\left(g\right)\)

chj kb vs em vs ạ em gửi tin nhắn rùi:)

\(n_{Cl_2}=\dfrac{1,68}{22,4}=0,075\left(mol\right)\)

PTHH: 2M + Cl₂ --t^o--> 2MCl

________0,075---->0,15

=> \(M_{MCl}=\dfrac{11,175}{0,15}=74,5\left(g/mol\right)\)

=> M_M = 39 (K)