Resposta :
Após balancear
Zn + 2 HCl ==> ZnCl2 + H2
Zn HCl
1mol ------ 2 mol
x ---------- 20 mol x = 10 mols
Zn + 2 HCl ==> ZnCl2 + H2
Zn HCl
1mol ------ 2 mol
x ---------- 20 mol x = 10 mols