Question

________ is a measure of the amount of matter in an object.

Answer 1

Mass i think hope and this helps u

Answer 2

Density = the degree of compactness of a substance.
Weight =  the force of gravity on the object
Mass = mass of an object is a measure of the number of atoms in it. 
Volume = mass of an object is a measure of the number of atoms in it. 

Hope this helps.