Calculate potential for reduction of molecular oxygen to hydrogen peroxide from latimer diagram given below 

 O2 ------> HO2 ------> H2O2 

O2/HO2 = E°= -0.20 V

HO2/H2O2 = E°= -0.80 V

Answer the following question regarding the Latimer diagram given for nitrogen oxides: Is NO stable with respect to disproportionation under standard conditions at 25^oC?

I found NO to be considered unstable under standard conditions because the right hand standard reduciton potential is greater than the left hand standard reduction potential. I don't know if this is correct or not.

Determine theredox potential for MnO4– conversion to Mn3+ atpH= 6.

Ifound thepotential from a Latimer diagram: 1.5 V. I know Imust use theequation

"POTENTIAL -(.059 X pH)," but I don't come up with the rightanswer (0.8 V)