oxidation state?? help!!! (2 Viewers)

[thuynguyen239]

i am struggling to find the answer for this oxidation question, can anyone help me please!!!

what is the oxidation state of chromium in ?? show all the working.

THANKS IN ADVANCE!!

 

[jamesfirst]

Sodium oxidation state is 1
Oxygen oxidation state is -2
Compound oxidation state is 0

So.... 2+ 2cr + 7*-2=0

Solve for cr

 

[13abie]

i am struggling to find the answer for this oxidation question, can anyone help me please!!!

what is the oxidation state of chromium in ?? show all the working.

THANKS IN ADVANCE!!

Na2+cr2+07=0
2(1) +cr2+ 7(-2) = 0
2 -14 +cr2 = 0
cr2=12
cr=6