A rock weighing 15.0g is placed in a cylinder displacing the volume from 25.0 to 36.2 what is the density of the rock in g/cm3

Density = mass/volume

The volume of the rock is = volume of raised after rock was put in the cylinder which is calculated by finding the difference in volumes

That is 36.2 - 25=11.2mls

convert ml to CM^3

1ml=1cm^3 what about 11.2ml=11.2cm^3

Density is therefore = 15g/11.2 cm^3 = 1.34 g/cm^3