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a, PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
b, Ta có: \(n_{Fe}=\dfrac{14}{56}=0,25\left(mol\right)\)
Theo PT: \(n_{HCl}=2n_{Fe}=0,5\left(mol\right)\)
\(\Rightarrow m_{HCl}=0,25.36,5=18,25\left(g\right)\)
c, Theo PT: \(n_{H_2}=n_{Fe}=0,25\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,25.22,4=5,6\left(l\right)\)
a, \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
PTHH: Zn + 2HCl ----> ZnCl2 + H2
Mol: 0,1 0,1
b, \(V_{H_2}=0,1.22,4=2,24\left(l\right)\)
PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
Ta có: \(n_{Zn}=\dfrac{32,5}{65}=0,5\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{HCl}=1\left(mol\right)\\n_{H_2}=0,5\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{ddHCl}=\dfrac{1\cdot36,5}{20\%}=182,5\left(g\right)\\V_{H_2}=0,5\cdot22,4=11,2\left(l\right)\end{matrix}\right.\)
nMg = 3,6 : 24 = 0,15 (mol)
pthh : Mg + 2HCl --> MgCl2 + H2
0,15-----------> 0,15 --->0,15 (mol)
mMgCl2 = 0,15 . 95 = 14,25 (mol)
VH2 (đkc)= 0,15. 24,79 = 3,718(l)
\(n_{Mg}=\dfrac{3,6}{24}=0,15mol\)
\(Mg+2HCl\rightarrow MgCl_2+H_2\)
0,15 0,3 0,15 0,15
\(m_{MgCl_2}=0,15\cdot95=14,25g\)
\(V_{H_2}=0,15\cdot22,4=3,36l\)
a+b+c) PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
Ta có: \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)=n_{ZnCl_2}=n_{H_2}\)
\(\Rightarrow\left\{{}\begin{matrix}m_{ZnCl_2}=0,1\cdot136=13,6\left(g\right)\\V_{H_2}=0,1\cdot22,4=2,24\left(l\right)\end{matrix}\right.\)
d) PTHH: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Theo PTHH: \(n_{H_2}=n_{Cu}=0,1\left(mol\right)\)
\(\Rightarrow m_{Cu}=0,1\cdot64=6,4\left(g\right)\)
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b, \(n_{Zn}=\dfrac{39}{65}=0,6\left(mol\right)\)
Theo PT: \(n_{HCl}=2n_{Zn}=1,2\left(mol\right)\Rightarrow m_{HCl}=1,2.36,5=43,8\left(g\right)\)
c, \(n_{H_2}=n_{Zn}=0,6\left(mol\right)\Rightarrow V_{H_2}=0,6.24,79=14,874\left(l\right)\)
d, - Quỳ tím hóa đỏ do HCl dư.
nFe = 16,8/56 = 0,3 (mol)
PTHH: Fe + 2HCl -> FeCl2 + H2
Mol: 0,3 ---> 0,6 ---> 0,3 ---> 0,3
VH2 = 0,3 . 24,79 = 7,437 (l)
mHCl = 0,6 . 36,5 = 21,9 (g)
PTHH: CuO + H2 -> (t°) Cu + H2O
Mol: 0,3 <--- 0,3 ---> 0,3
mCu = 0,3 . 64 = 19,2 (g)
mFe = 16,8: 56 =0,3(mol)
pthh : Fe + 2HCl --> FeCl2 + H2 (1)
0,3 ->0,6-----------------> 0,3 (mol)
=> VH2 (đkc) = 0,3 . 24,79 ( l)
=> mHCl = 0,6 . 35,5 = 21,9 (g)
pthh : CuO + H2 -t--> Cu+ H2O
0,3<-----0,3 (mol)
=>mCu = 0,3 . 64 = 19,2 (g)
$a\big)2Al+6HCl\to 2AlCl_3+3H_2$
$b\big)$
$n_{Al}=\dfrac{5,4}{27}=0,2(mol)$
Theo PT: $n_{H_2}=\dfrac{3}{2}n_{Al}=0,3(mol)$
$\to V_{H_2(đktc)}=0,3.22,4=6,72(l)$
$c\big)$
Theo PT: $n_{AlCl_3}=n_{Al}=0,2(mol)$
$\to m_{AlCl_3}=0,2.133,5=26,7(g)$
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b, \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
Theo PT: \(n_{H_2}=n_{Zn}=0,1\left(mol\right)\Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)
c, \(n_{HCl}=2n_{Zn}=0,2\left(mol\right)\Rightarrow m_{HCl}=0,2.36,5=7,3\left(g\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(1mol\) \(2mol\) \(1mol\)
\(0,1mol\) \(0,2mol\) \(0,1mol\)
\(n_{Zn}=\dfrac{m}{M}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
\(m_{HCl}=n.M=0,2.36,5=7,3\left(g\right)\)
\(V_{H_2}=n.22,4=0,1.22,4=2,24\left(l\right)\)