Agraduated cylinder is filled to 32.6 ml with water and a piece of granite is placed in the cylinder, displacing the level to 40.7 ml. what is the volume of the granite piece in cubic centimeters?

The method use to determine the volume of the granite is more commonly called water-displacement method. A more common method that is usually used for irregularly shaped objects. To determine the volume of the granite, we just have to subtract the initial volume from the final volume. That is,
                     volume of granite = 40.7 mL - 32.6 mL = 8.1 mL 

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 !