11. Gọi kl là A
2A +2 H2O -------> 2AOH +H2
n H2 = 0.48/2 = 0.24 mol
=> n A = 0.24*2 = 0.48 mol
=> M A = 3.33/0.48=
12.A + 2H2O-------> A(OH)2 + H2
n H2 = 0.366/22.4= 0.015 mol
=> n A = 0.015 mol
=> M A = 0.6/0.015= 40
=> A là Ca
13.
2A + 6HCL -------> 2ACl3 +3 H2
n H2 = 5.04/22.4=0.225 mol
=> n A = 0.225/3*2 =0.15 mol
=> M A = 4.05/0.15=27
=> A la Al