Once again I have reached an impasse and find that I need the help of experts. My American contacts have not been so swift to reply as this group has been in the past. I seek information about the oxidation of Fe3C by nitric acid to produce carbon dioxide, iron(III) nitrate, nitrogen dioxide, and water. In particular, the bonding, balancing, and oxidation states of Fe and C in Fe3C, often referred to as cementite. Help?! Thanx in advance.