Nitrogen dioxide, decomposition metals

Another "OH generating reaction is peroxynitrite decomposition to hydroxyl radical and nitrogen dioxide (see sect. 1.12). Also, actions of ionizing radiation and ultrasounds yielding water molecule decomposition are additional sources of "OH. The hydroxyl radical is probably the main reactive species in the so-called metal-catalyzed oxidation systems (or mixed-function oxidation systems) used in experiments where ascorbate and metal ions are employed (though formation of other products such as high-valency iron species ferryl Fe+4 or perferryl Fe+5 forms cannot be excluded) (N2, S50). 

Nitrates are made up of a metal, nitrogen and oxygen. Most nitrates undergo thermal decomposition to the metal oxide, oxygen and nitrogen dioxide ... 

SoUd silver nitrate undergoes thermal decomposition to form silver metal, nitrogen dioxide, and oxygen. Write the chemical equation for this reaction. A 0.443-g sample of silver metal is obtained from the decomposition of a 0.784-g sample of AgN03. What is the percent yield of the reaction ... 

---