How are gases all so similar unlike any other state of matter?
1) 1 mole of any gas will occupy 22.4 litres at atmospheric pressure. (Cannot be said of all solids/ liquids)
2) partial pressure of any gas is directly proportional only to mole fraction. ( even weight of atoms is irrelevant.)
I guessed it would be due to negligible intermolecular attractions but I'm not too clear. Could someone explain.