Answer: 15.0
Step-by-step explanation:
1) The chemical formula of silver nitrate is AgNO₃
2) The chemical formula of silver chloride is AgCl
3) Therefore, by mass balance you know that all the atoms of Ag in AgNO₃ will en up at the AgCl. This is a mole ratio 1:1.
4) Since, there are 15.0 moles of Ag atoms in 15.0 moles of AgNO₃, you conclude, using the 1: 1 ratio, that 15.0 moles of AgCl are produced.