Two or more atoms can be held together shared

Depends:
1) A metal and another metal: Metalic bonds.
2) A metal and a non-metal: Ionic bonds (Transfer of electrons).
3) A non-metal and another non-metal: Covalent bonds (Sharing of electrons).

I'm not sure but i will try to find out

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 !