At 1 atm, equal masses of H2O (s), H2O (ℓ), and

H2O (g) have

(1) the same density

(2) the same distance between molecules

(3) different volumes

(4) different percent compositions

Answer: option (3) different volumes.

Justification:

The three spieces H₂O (s), H₂O (ℓ), and H₂O (g) are the same substance (water) in different physical states.

H₂O (s) is solid, H₂O (ℓ) is liquid, and H₂O (g) is gaseous.

Solid substances have the shortest distance between molecules (although there is an exception with water between - 4 and 0°C), liquis have greater distance between molecules than solids, and gaseous molecules have the greatest distances between molecules of the trhee.

In conclusion, as the distances between the molecules are different, and the masses (amount of molecules) are the same, they will occupy different volumes.

(3) different volumes is the correct answer