The sum of all oxidation numbers:

in a neutral molecule = 0

in an ion = a + charge

in an ion = the charges on neutral atoms

do not need to be equal on both sides of a chemical equation

Since there is the same amount of agn03 in both silver chloride and silver nitrate they produce the same amount of moles. therefore silver chloride produces the same amount of silver nitrate, so your answer is 15.0 moles of silver nitrate. i hope this !