Help understanding avogadro's law?

Yarimashita.

New member
My textbook states that

regardless of what type of molecule it is

the same moles of different molecules take up the same volume

But why is this? Why doesn't the size of the molecule not factor into the volume? Why doesn't the fact that NH3 has 4 atoms and H2 has only 2 atoms affect either of their volumes and that 1 mol of NH3 = the same volume as 1 mole of H2?
 
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