Giúp em với ạ, Cho m g Al tác dụng với dung dịch H2SO4 vừa đủ thu được 3,36 lít khí hiđro ở đktc a) Tính m. b) Tính khối lượng muối tạo thành.
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(n_{Al}=\dfrac{5,4}{27}=0,2mol\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
0,2 0,1 0,3 ( mol )
\(m_{Al_2\left(SO_4\right)_3}=0,1.342=34,2g\)
\(V_{H_2}=0,3.22,4=6,72l\)
![](https://rs.olm.vn/images/avt/0.png?1311)
2Al+3H2SO4->Al2(SO4)3+3H2
0,1----------------------0,075----0,15
n H2=0,15 mol
=>mAl=0,1.27=2,7g
=>m Al2(SO4)3=0,075.342=25,65g
a) PTHH: \(2Al+3H_2SO_2\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
b) \(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
\(n_{Al}=\dfrac{2}{3}.0,15=0,1\left(mol\right)\)
\(m_{Al}=0,1.27=2,7\left(g\right)\)
c) \(n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{2}.0,1=0,05\left(mol\right)\)
\(m_{Al_2\left(SO_4\right)_3}=0,05.342=17,1\left(g\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
0,1-->0,2------>0,1-->0,1
=> VH2 = 0,1.22,4 = 2,24 (l)
mZnCl2 = 0,1.136 = 13,6 (g)
b) \(C\%_{dd.HCl}=\dfrac{0,2.36,5}{200}.100\%=3,65\%\)
c) \(n_{O_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
PTHH: 2H2 + O2 --to--> 2H2O
Xét tỉ lệ: \(\dfrac{0,1}{2}< \dfrac{0,15}{1}\) => H2 hết, O2 dư
PTHH: 2H2 + O2 --to--> 2H2O
0,1--------------->0,1
=> mH2O = 0,1.18 = 1,8 (g)
![](https://rs.olm.vn/images/avt/0.png?1311)
nAl = 5,4 / 27 = 0,2(mol)
2Al + 3H2SO4--- > Al2(SO4)3 + 3H2
0,2 0,3 0,1 0,3 (mol)
VH2SO4 = n/ CM = 0,3 / 2 = 0,15(l)
=> V1 = 150 ml
mAl2(SO4)3 = 0,1 . 342 = 34,2 (g)
Al2(SO4)3 + 3BaCl2 -- > 3BaSO4 + 2AlCl3
0,1 0,1
=> mBaSO4 = 0,1 . 233 = 23,3 (g)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) $n_{Al} = 0,2(mol)$
b)
$n_{H_2SO_4} = \dfrac{294.20\%}{98} = 0,6(mol)$
$2Al + 3H_2SO_4 \to Al_2(SO_4)_3 + 3H_2$
$Al_2O_3 + 3H_2SO_4 \to Al_2(SO_4)_3 + 3H_2O$
$\Rightarrow n_{Al_2O_3} = \dfrac{0,6 - 0,2.1,5}{3} = 0,1(mol)$
$m = 0,1.102 = 10,2(gam)$
$n_{Al_2(SO_4)_3} = \dfrac{1}{3}n_{H_2SO_4} = 0,2(mol)$
$m_{dd} = 0,2.27 + 10,2 + 294 - 0,3.2 = 309(gam)$
$C\%_{Al_2(SO_4)_3} = \dfrac{0,2.342}{309}.100\% = 22,1\%$
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(2Al + 6HC l\to 2AlCl_3 + 3H_2\)
b)
\(n_{Al} = \dfrac{5,4}{27} = 0,2(mol)\\ \Rightarrow n_{H_2} = \dfrac{3}{2}n_{Al} = 0,3(mol)\\ \Rightarrow V_{H_2} = 0,3.22,4 = 6,72(lít)\\ c) n_{AlCl_3} = n_{Al} = 0,2(mol)\\ m_{AlCl_3} = 0,2.133,5 = 26,7(gam)\)
a) PTHH : 2Al+6HCl → 2AlCl3 + 3H2
b)Ta có : mAl=5,4(g)→ nAl=0,2(mol)
PTHH : 2Al+6HCl → 2AlCl3 + 3H2
2 6 2 3
0,2 0,6 0,2 0,3 (mol)
VH2= 0,3 . 22,4=6,72(l)
c) mAlCl3= 0,2 . 133,5=26,7(g)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(n_{Mg}=\dfrac{3,6}{24}=0,15\left(mol\right)\)
\(PTHH:Mg+2HCl\rightarrow MgCl_2+H_2\)
\(\left(mol\right)\) \(0,15\) \(0,3\) \(0,15\) \(0,15\)
\(a.V_{H_2}=0,15.22,4=3,36\left(l\right)\\ b.m_{MgCl_2}=95.0,15=14,25\left(g\right)\\ c.\\ PTHH:CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
\(\left(mol\right)\) \(0,15\) \(0,15\) \(0,15\)
\(m_{Cu}=0,15.64=9,6\left(g\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
nH2 = 3,36 : 22,4 = 0,15 (mol) => nSO42-= nH2 = 0,15 (mol)
BTKL : mmuối = mKL + mSO42- = 5,2 + 0,15.96 = 19,6 (gam)
Đáp án D
a,\(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
PTHH: 2Al + 3H2SO4 → Al2(SO4)3 + 3H2
Mol: 0,1 0,05 0,15
\(m_{Al}=0,1.27=2,7\left(g\right)\)
b,\(m_{Al_2\left(SO_4\right)_3}=0,05.342=17,1\left(mol\right)\)