а) Zn + H2SO4 = ZnSO4 + H2
б) 2Al + 3H2SO4 = Al2(SO4)3 + 3H2
в) Zn + 2HCl = ZnCl2 + H2
https://ru-static.z-dn.net/files/d2a/950238ebe3501a35efd42da87ce28a58.jpg
2K+O2=2K2O
2Mg+O2= 2MgO
2Ag+2O2=2Ag2O
2C2H5OH + 2Na = 2C2H5ONa + H2
9.2/46 = x/22.4
x = 4.48 л — теоретически.
ŋ(H2)= 90% ==>
ŋ(практ.)= (4.48 * 0.9)= 4.032 л