a)

\(n_{H_2} = \dfrac{1,12}{22,4} = 0,05(mol)\\ 2Al + 6HCl \to 2AlCl_3 + 3H_2\)

Ta thấy : 

\(n_{HCl} = 0,2 > 2n_{H_2} = 0,1\) nên HCl dư.

Theo PTHH : \(n_{Al} = \dfrac{2}{3}n_{H_2} = \dfrac{1}{30}(mol)\\ \Rightarrow m_{Al} = \dfrac{1}{30}.27 = 0,9(gam)\)

Ta có :

\(n_{HCl\ pư} = 2n_{H_2} = 0,1(mol)\\ \Rightarrow n_{HCl\ dư} = 0,2 - 0,1 = 0,1(mol)\\ \Rightarrow m_{HCl\ dư} = 0,1.36,5 = 3,65(gam)\)

\(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)

a/ \(n_{HCl}=0,2\left(mol\right)\)

\(n_{H_2}=0,05\left(mol\right)\)

Theo PTHH

\(n_{Al}=\dfrac{3}{2}.n_{H_2}=0,075\left(mol\right)\)

Lập tỉ lệ

\(\dfrac{n_{Al}}{2}=0,0375< \dfrac{n_{HCl}}{6}\)

=> Al phản ứng hết, HCl phản ứng dư

b/ \(m_{Al_{p.ứ}}=0,075.27=2,025\left(g\right)\)

Khong chắc lắm!

Ta có: \(n_{H_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)

\(a,PTHH:2Al+6HCl--->2AlCl_3+3H_2\uparrow\)

Theo PT: \(n_{Al}=\dfrac{2}{3}.n_{H_2}=\dfrac{2}{3}.0,05=\dfrac{1}{30}\left(mol\right)\)

\(\Rightarrow m_{Al}=\dfrac{1}{30}.27=0,9\left(g\right)\)

b. Ta thấy: \(\dfrac{\dfrac{1}{30}}{2}>\dfrac{0,02}{6}\)

Vậy nhôm dư.

\(a,PTHH:2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)

\(n_{H_2}=\dfrac{V_{\left(đktc\right)}}{22,4}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)

\(b,Ta.có:\dfrac{n_{HCl}}{6}=\dfrac{0,02}{6}=\dfrac{1}{300}< \dfrac{n_{H_2}}{3}=\dfrac{0,5}{3}=\dfrac{1}{6}\)

\(Theo.PTHH:n_{Al}=\dfrac{1}{3}.n_{HCl}=\dfrac{1}{3}.0,02=\dfrac{1}{150}\left(mol\right)\\ m_{Al}=n.M=\dfrac{1}{150}.27=0,18\left(g\right)\)

\(Theo.PTHH:n_{H_2\left(phản.ứng\right)}=\dfrac{1}{2}.n_{HCl}=\dfrac{1}{2}.0,02=0,01\left(mol\right)\\ n_{H_2\left(dư\right)}=n_{H_2\left(tổng\right)}-n_{H_2\left(phản.ứng\right)}=0,05-0,01=0,04\left(mol\right)\\ m_{H_2\left(dư\right)}=n_{H_2\left(dư\right)}.M=0,04.2=0,08\left(g\right)\)

Ta có: \(n_{H_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)

a. PTHH: 2Al + 6HCl ---> 2AlCl₃ + 3H₂.

b. Theo PT: \(n_{Al}=\dfrac{2}{3}.n_{H_2}=\dfrac{2}{3}.0,05=\dfrac{1}{30}\left(mol\right)\)

=> m_Al = \(\dfrac{1}{30}.27=0,9\left(g\right)\)

Chi tiết rồi đấy bn, mik sẽ ghi CT có trong bài:

- \(m=M.n\)

=> \(n=\dfrac{m}{M}\)

Trong đó:

M là khối lượng mol trong bảng hóa trị.

n là số mol.

\(\left(M_H=1;M_{Al}=27;M_{Cl}=35,5\right)\)

nHCl=0,2(mol)

nH2= 1,12/22,4=0,05(mol)

a) PTHH: 2Al + 6 HCl -> 2AlCl3 + 3 H2

b) Ta có: 0,2/6 > 0,05/3

=> H2 hết, HCl dư, tính theo nH2

nHCl(dư)= 0,2 - 6/3 . 0,05=0,1(mol)

=> mHCl(dư)=36,5.0,1=3,65(g)

c) nAlCl3= 2/3. 0,05=1/30(mol)

=> mAlCl3= 1/30. 133,5=4,45(g)

2Al+6HCl → 2AlCl3 + 3H2

2Al+6HCl->2AlCl₃+3H₂

0,05----0,15------------------0,075 mol

n _H2=\(\dfrac{1,68}{22,4}\)=0,075 mol

=>m _Al=0,05.27=1,35g

=>HCl dư =>m _HCl=0,1.36,5=3,65g

theo dõi mk dc k

\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)

\(n_{Al}=\dfrac{3,375}{27}=0,125\)

\(\Rightarrow n_{H_2}=\dfrac{0,125}{2}.3=0,1875mol\)      \(\Rightarrow V_{H_2}=0,1875.22,4=4,2l\)

\(n_{AlCl_3}=n_{Al}=0,125mol\)       \(\Rightarrow m_{AlCl_3}=0,125.133,5=16,6875g\)