Which statement best describes the kinetic molecular
theory?
The kinetic molecular theory relates the properties of a state of matter to the motion of
its molecules.
B
The kinetic molecular theory relates the properties of a state of matter to the mass of its
molecules.
C
The kinetic molecular theory relates the properties of a state of matter to the size of its
molecules.
D
The kinetic molecular theory relates the properties of a state of matter to the diameter of
its molecules.

A. The kinetic molecular theory relates the properties of a state of matter to the motion of  its molecules.

Explanation:

The higher the kinetic energy of the molecules, the faster its movement will be. The state of a matter will depend on how fast the molecules move. When the molecules barely move, it will be packed tightly and its state will be solid. If the molecules kinetic energy rises, eventually they start moving around and the state will be liquid. If the kinetic energy rises further, the molecule will expand and changed into gas form.

it is the most commonly accepted one

hey there!

mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b