View attachment 106081 Giúp mình vớiiiiiiiiiiiiiiiiiiii
2Al+2NaOH+2H2O--->2NaAlO2+3H2
0,08________________________0,12
=>2,16
Cu-->Cu2+ + 2e
a___________2a
Fe-->Fe3+ +3e
b_________3b
Al-->Al3+ +3e
0,08______0,24
N+5 + 3e---> N+2
_____0,39______0,13
=> 2a+3b=0,39-0,24=0,15
Mặt khác: 64a+56b=4
=> a , b
=>% mỗi kloai
m cr B= m Ag =...