Bài 5
\(n_{Al_2O_3}=\dfrac{10,2}{102}=0,1\left(mol\right)\)
\(n_{HCl}=\dfrac{18,25}{36,5}=0,5\left(mol\right)\)
PTHH: Al2O3 + 6HCl --> 2AlCl3 + 3H2O
Xét tỉ lệ: \(\dfrac{0,1}{1}>\dfrac{0,5}{6}\) => Al dư, HCl hết
PTHH: Al2O3 + 6HCl --> 2AlCl3 + 3H2O
\(\dfrac{1}{12}\)<----0,5------->\(\dfrac{1}{6}\)----->0,25
=> \(\left\{{}\begin{matrix}m_{Al\left(dư\right)}=10,2-\dfrac{1}{12}.102=1,7\left(g\right)\\m_{AlCl_3}=\dfrac{1}{6}.133,5=22,25\left(g\right)\\m_{H_2}=0,25.18=4,5\left(g\right)\end{matrix}\right.\)
Bài 6
a) \(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
\(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)
PTHH: Mg + 2HCl --> MgCl2 + H2
0,1<-------------0,1<----0,1
=> \(n_{Mg\left(pư\right)}=0,1\left(mol\right)< 0,2\)
=> Mg dư => HCl hết
b) \(m_{MgCl_2}=0,1.95=9,5\left(g\right)\)
\(m_{Mg\left(dư\right)}=\left(0,2-0,1\right).24=2,4\left(g\right)\)
h tới mai mà k cs ng lm thì t lm hết h đi ngủ :>