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![](https://rs.olm.vn/images/avt/0.png?1311)
\(2Al + 6HCl \rightarrow 2AlCl_3 + 3H_2\)
\(n_{Al}= \dfrac{5,4}{27}= 0,2 mol\)
Theo PTHH:
\(n_{AlCl_3}= n_{Al}= 0,2 mol\)
\(\Rightarrow m_{AlCl_3}= 0,2 . 133,5=26,7 g\)
Theo PTHH:
\(n_{H_2}= \dfrac{3}{2} n_{Al}= 0,3 mol\)
\(\Rightarrow V= 0,3 . 22,4= 6,72 l\)
b)
Theo PTHH:
\(n_{HCl}= 3n_{Al}= 0,6 mol\)
\(\Rightarrow m_{HCl}= 0,6 . 36,5=21,9 g\)
\(\Rightarrow m_{dd HCl}= \dfrac{21,9 . 100}{15}= 146 g\) ( nếu ở tử là : 21,9 . 100% thì ở mẫu bạn chia cho 15% nhé)
![](https://rs.olm.vn/images/avt/0.png?1311)
Mg+ 2HCl\(\rightarrow\) MgCl2+ H2
nMg= nMgCl2=\(\frac{2,4}{24}\)= 0,1 mol
\(\rightarrow\)mMgCl2= 0,1.95= 9,5g
![](https://rs.olm.vn/images/avt/0.png?1311)
Na2O+h2O->2NaOH
0,2------------------0,4
n Na2O=12,4\62=0,2 mol
=>m NaOH=0,4.40=40,4g
=>C%=40,4\12,4+200=19%
\(n_{Na_2O}=\dfrac{12,4}{62}=0,2\left(mol\right)\\ Na_2O+H_2O\rightarrow2NaOH\\ n_{NaOH}=0,2.2=0,4\left(mol\right)\\ m_{ddNaỌH}=12,4+200=212,4\left(g\right)\\ C\%_{ddNaOH}=\dfrac{0,4.40}{212,4}.100\approx7,533\%\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: \(n_{H_2}=\dfrac{1,344}{22,4}=0,06\left(mol\right)\)
PTHH:
2Al + 6HCl ---> 2AlCl3 + 3H2 (1)
Al2O3 + 6HCl ---> 2AlCl3 + 3H2 (2)
Theo PT(1): \(n_{Al}=\dfrac{2}{3}.n_{H_2}=\dfrac{2}{3}.0,06=0,04\left(mol\right)\)
\(\Rightarrow m_{Al}=0,04.27=1,08\left(g\right)\)
\(\Rightarrow m_{Al_2O_3}=2,1-1,08=1,02\left(g\right)\)
\(\Rightarrow n_{Al_2O_3}=\dfrac{1,02}{102}=0,01\left(mol\right)\)
Theo PT(1): \(n_{HCl}=3.n_{Al}=3.0,04=0,12\left(mol\right)\)
Theo PT(2): \(n_{HCl}=6.n_{Al_2O_3}=6.0,01=0,06\left(mol\right)\)
\(\Rightarrow m_{HCl}=\left(0,06+0,12\right).36,5=6,57\left(g\right)\)
Ta có: \(C_{\%_{HCl}}=\dfrac{6,57}{m_{dd_{HCl}}}.100\%=7,3\%\)
\(\Rightarrow m_{dd_{HCl}}=90\left(g\right)\)
\(n_{NaCl}=0,2.0,2=0,04\left(mol\right)\\ m_{NaCl}=0,04.58,5=2,34\left(g\right)\)
bị nhầm HCl à em