giúp mình 2 câu này với ạ mình cảm ơn nhiều

$6,$

$n_{O_2}=0,3(mol)$

$n_{H_2}=0,3(mol)$

`-` Bảo toàn $e:$

$3n_{Al}=4n_{O_2}+2n_{H_2}$

`=>`$n_{Al}=\dfrac{4 \cdot 0,3+2 \cdot 0,3}{3}=0,6(mol)$

`=>`$m=0,6 \cdot 27=16,2(g)$

`-` Không có $x$ trong đề bài.

$x=?$

$7,$

$n_{Zn}=\dfrac{26}{65}=0,4(mol)$

$n_{O_2}=0,15(mol)$

`-` Bảo toàn $e:$

$2n_{Zn}=4n_{O_2}+2n_{H_2}$

`=>`$n_{H_2}=\dfrac{0,4 \cdot 2 -4 \cdot 0,15}{2}=0,1(mol)$

`=>`$V=2,24(l)$

`-` Bảo toàn nguyên tố $H:$

$n_{HCl}=2n_{H_2}=0,2(mol)$

`=>`$m_{HCl}=0,2 \cdot 36,5=7,3(g)$

$\rm 6)\\n_{H_2}=0,3(mol)\\4Al+3O_2\xrightarrow[]{t^o}2Al_2O_3\\0,6-0,45-0,3(mol)\\Al_2O_3+6HCl\xrightarrow[]{}2AlCl_3+3H_2\\0,3-0,3-0,3-0,3(mol)\\\xrightarrow[]{}m=0,6.27=16,2(g)\\7)\\n_{Zn}=0,4(mol)\\n_{O_2}=0,15(mol)\\O_2+2ZnO\xrightarrow[]{t^o}2ZnO\\0,15-0,3-0,3(mol)\\\xrightarrow[]{}n_{ZnO(dư)}=0,1(mol)\\ZnO+2HCl\xrightarrow[]{}ZnCl_2+H_2O\\0,1\xrightarrow[]{}0,2\xrightarrow[]{}0,1\xrightarrow[]{}0,1(mol)\\\xrightarrow[]{}\\V=0,1.22,4=2,24(l)\\m_{HCl}=0,2.36,5=7,3(g)$