according tk. the law of conservation of. mass, during. chemical changes the total amount of matter remains constant the figure shows the reactants and products of the combustion reaction of methane gas

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 !