minh tra loi the nay nhan:D
quy FexOy thanh b mol Fe va c mol oxi
a la nCu
ta co: 64a + 56b + 16c = 4,88 (1)
ta co pt cho nhan e:
Fe = Fe+3 + 3e
Cu = Cu+2 + 2e
O + 2e = O-2
N+5 +3e = N+2
N+5 +1e = N+4
dua vao khoi luong mol trung binh tinh dc so mol NO=0,02 va NO2=0,03
taco pt tiep theo: 2a +3b - 2c = 0.02x3 +0,03=0,09 (2)
dua vao khoi luong muoi tao thanh ta co : 188a+242b= 14,78 (3)
giai he 3 pt
dc:
a=0,04 b=0,03 c=0,04
ta co nFe/x = nO/y
x=3 y=4
CT Fe3O4
b)
co so mol 2 chat nay rui viet pt tinh la ra thoi
chu y Cu ko phan ung voi HCl nhan ban..
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