Final answer:
To find the volume of the rock, Connor should measure its volume by water displacement. Then, to determine the rock's density, divide its mass by the volume obtained.
Step-by-step explanation:
The first step Connor should take to find the volume of the rock is to measure the rock's volume (d). Although this seems circular, there is a method to do so using water displacement. Connor can submerge the rock in a graduated cylinder filled with water and measure the amount of water displaced, which is equivalent to the volume of the rock. This is based on Archimedes' principle.
From there, to find the density, he would divide the mass of the rock by its volume. For example, if a rock displaces 89.0 cm³ of water, and the mass of the rock is 240 g, the density would be 240 g / 89.0 cm³, giving a result that can be compared with the average density for granite to see if they are consistent.