giải giúp mik với mik cảm ơn

Bạn tham khảo:

$2/$

$2Al+3Cl_2 \xrightarrow{t^{o}} 2AlCl_3$

$n_{Al}=0,2(mol)$
$n_{Cl_2}=0,3(mol)$

$V_{Cl_2}=6,72(l)$
$n_{AlCl_3}=0,2(mol)$
$m_{AlCl_3}=0,2.62,5=12,5(g)$

$3/$

$a/ 2Mg+O_2 \to 2MgO$

$b/ 2Al+3H_2SO_4 \to Al_2(SO_4)_3+3H_2$
$c/ K+H_2O \to KOH+\frac{1}{2}H_2$
$d/ H_2+Br_2 \to 2HBr$