Which group has a full octet and does therefore not need to make ions

True, the standard unit for volume is liters which can be represented by either a lower case "l" or a capital "l"

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 !

Is a logical series of steps

B"hf and f-"  is the correct answer took the test on edgenuity and got it right