Question

which is a postulate of the kinetic - molecular theory?
gas particles have a small volume relative to the spaces between them.
gas particles have a large volume relative to the spaces between them.
gas particles are very small in size and always move slowly.
gas particles are very large in size and always move slowly.

Explanation:

The kinetic - molecular theory states that gas particles are in constant random motion. The volume of gas particles is negligible compared to the total volume of the gas (i.e., gas particles have a small volume relative to the spaces between them). Gas particles move at various speeds (not always slowly), and their size is small.

Answer:

Gas particles have a small volume relative to the spaces between them.