You have too many omissions in the equation. That should e [Cr2O7]^2-, I have no idea what NO-2 is (probably [NO2]^-), [NO3]^-
Here is a good site that will tell you to assign oxidation states to each element and use that to balance redox equations.
If you have more trouble after that, repost but take care to get the charges and formulas correct.
http://www.chemteam.info/Redox/Redox.html
REDOX balancing reaction Cr2O7 + NO-2 Cr3+ + NO3 (acid medium)
1 answer
1 answer