cho 2,9g nhôm vào lọ đựng axit HC
A: tính khối lượng muói tlhu được sau phản ứng
B: tính thể tích khí hiđro thoát ra ở (đktc)
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(1.a.2Al+6HCl\rightarrow2AlCl_3+3H_2\\ b.n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\\ TheoPT:n_{AlCl_3}=n_{Al}=0,4\left(mol\right)\\ \Rightarrow m_{AlCl_3}=0,4.133,5=53,4\left(g\right)\\ c.TheoPT:n_{H_2}=\dfrac{3}{2}n_{Al}=0,6\left(mol\right)\\ \Rightarrow V_{H_2}=0,6.22,4=13,44\left(l\right)\)
\(2.a.Mg+2HCl\rightarrow MgCl_2+H_2\\ b.n_{HCl}=\dfrac{25,55}{36,5}=0,7\left(mol\right)\\ TheoPT:n_{Mg}=\dfrac{1}{2}n_{HCl}=0,35\left(mol\right)\\ \Rightarrow m_{Mg}=0,35.24=8,4\left(g\right)\\ c.TheoPT:n_{H_2}=\dfrac{1}{2}n_{HCl}=0,35\left(mol\right)\\ \Rightarrow V_{H_2}=0,35.22,4=7,84\left(l\right)\)
a. \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
\(n_{Al}=\dfrac{m_{Al}}{M_{Al}}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
Theo PTHH: \(n_{AlCl_3}=n_{Al}=0,2\left(mol\right)\)
Khối lượng muối thu được:
\(m_{AlCl_3}=n_{AlCl_3}.M_{AlCl_3}=0,2.133,5=26,7\left(g\right)\)
b. Theo PTHH: \(n_{H_2}=\dfrac{n_{Al}.3}{2}=\dfrac{0,2.3}{2}=0,3\left(mol\right)\)
Thể tích khí hiđro thu được:
\(V_{H_2}=n_{H_2}.22,4=0,3.22,4=6,72\left(l\right)\)
PTHH: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\uparrow\)
Ta có: \(n_{H_2SO_4}=0,2\cdot1,5=0,3\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{Al}=0,2\left(mol\right)\\n_{Al_2\left(SO_4\right)_3}=0,1\left(mol\right)\\n_{H_2}=0,3\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{Al}=0,2\cdot27=5,4\left(g\right)\\V_{H_2}=0,3\cdot22,4=6,72\left(l\right)\\C_{M_{Al_2\left(SO_4\right)_3}}=\dfrac{0,1}{0,2}=0,5\left(M\right)\end{matrix}\right.\)
Bài 1 :
a. \(n_{Al}=\dfrac{2.7}{27}=0,1\left(mol\right)\)
PTHH : 2Al + 6HCl -> 2AlCl3 + 3H2
0,1 0,3 0,15
b. \(V_{H_2}=0,15.22,4=3,36\left(l\right)\)
c. \(m_{HCl}=0,3.36,5=10,95\left(g\right)\)
Bài 2 :
a. \(n_{Na}=\dfrac{2.3}{23}=0,1\left(mol\right)\)
PTHH : 2Na + 2H2O -> 2NaOH + H2
0,1 0,1 0,05
b. \(V_{H_2}=0,05.22,4=1,12\left(l\right)\)
c. \(m_{NaOH}=0,1.40=4\left(g\right)\)
PTHH: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\uparrow\)
Làm gộp các phần còn lại
Ta có: \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\) \(\Rightarrow\left\{{}\begin{matrix}n_{Al_2\left(SO_4\right)_3}=0,1mol\\n_{H_2SO_4}=n_{H_2}=0,3mol\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}V_{H_2}=0,3\cdot22,4=6,72\left(l\right)\\m_{Al_2\left(SO_4\right)_3}=0,1\cdot342=34,2\left(g\right)\\m_{H_2SO_4}=0,3\cdot98=29,4\left(g\right)\end{matrix}\right.\)
a)
$n_{Al} = \dfrac{8,1}{27} = 0,3(mol)$
$2Al + 6HCl \to 2AlCl_3 + 3H_2$
Theo PTHH :
$n_{H_2} = \dfrac{3}{2}n_{Al} = 0,45(mol)$
$V_{H_2} = 0,45.22,4 = 10,08(lít)$
b) $n_{HCl} = 3n_{Al} = 0,9(mol)$
$\Rightarrow m_{dd\ HCl} = \dfrac{0,9.36,5}{3,65\%} = 900(gam)$
c)
$m_{dd\ sau\ pư}= 8,1 + 900 - 0,45.2 = 907,2(gam)$
$n_{Al_2(SO_4)_3} = \dfrac{1}{2}n_{Al} = 0,15(mol)$
$C\%_{Al_2(SO_4)_3} = \dfrac{0,15.342}{907,2}.100\% = 5,65\%$
\(n_{Al}=\dfrac{5.4}{27}=0.2\left(mol\right)\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
\(0.2..........0.3.................................0.3\)
\(m_{H_2SO_4}=0.3\cdot98=29.4\left(g\right)\)
\(V_{H_2}=0.3\cdot22.4=6.72\left(l\right)\)
a, \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
PTHH: 2Al + 3H2SO4 → Al2(SO4)3 + 3H2
Mol: 0,2 0,3 0,3
\(m_{H_2SO_4}=0,3.98=29,4\left(g\right)\)
b, \(V_{H_2}=0,3.22,4=6,72\left(l\right)\)
`a)PTHH:`
`2Al + 6HCl -> 2AlCl_3 + 3H_2`
`0,2` `0,6` `0,3` `(mol)`
`n_[Al]=[5,4]/27=0,2(mol)`
`b)V_[H_2]=0,3.22,4=6,72(l)`
`c)m_[dd HCl]=[0,6.36,5]/10 . 100 =219(g)`
a) PTHH: \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
\(2mol\) \(6mol\) \(2mol\) \(3mol\)
\(0,27\) \(x\) \(y\) \(z\)
b) ta có: \(n_{Al}=\dfrac{m_{Al}}{M_{Al}}=\dfrac{7,3}{27}=0,27\left(mol\right)\)
theo PT: \(n_{Al}=n_{AlCl_3}=0,27\left(mol\right)\)
\(\Rightarrow m_{AlCl_3}=n_{AlCl_3}.M_{AlCl_3}=0,27.133,5=36,045\left(g\right)\)
c) ta có: \(n_{H_2}=\dfrac{m_{H_2}}{M_{H_2}}=\) \(\dfrac{0,27.3}{2}=0,405\left(mol\right)\)
\(\Rightarrow V_{H_2\left(đktc\right)}=n_{H_2}.22,4=0,405.22,4=9,072\left(l\right)\)
cho 2,9g nhôm vào lọ đựng axit HC
A: tính khối lượng muối thu được sau phản ứng
B: tính thể tích khí hiđro thoát ra ở (đktc)
n Al = 0,11 mol
2Al+6HCl->2AlCl3+3H2
0,11---------0,11-------0,165 mol
=>m AlCl3 =0,11.133,5=14,685g
=>VH2=0,165.22,4=3,696l