Which one of the following series of lines in the hydrogen spectrum arises from transitions down to n=2

Balmer series of lines arises when the transitions occur down to n=2

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 !