Question

[kudoshinichi]

 Giup em voi e can gap aj

Answer 1

[hnamyuh]

$Zn + H_2SO_4 \to ZnSO_4 + H_2$
$n_{H_2} = n_{Zn} = \dfrac{19,5}{65} = 0,3(mol)$
$V_{H_2} = 0,3.22,4 = 6,72(lít)$

$2Al + 3H_2SO_4 \to Al_2(SO_4)_3 + 3H_2$
Theo PTHH : 

$n_{Al} = \dfrac{2}{3}n_{H_2} = 0,2(mol)$
$m_{Al} = 0,2.27 = 5,4(gam)$

Answer 2

[kudoshinichi]

thankssssssssssssssssssss