1) What is the actual volume occupied by water molecules present in 20 cm3 of water ? A) 20 $cm^{3}$ B) 10 $cm^{3}$ C) 40 $cm^{3}$ D) 24.89 $cm^{3}$ Answer: Option BExplanation:Half of the volume occupied in water is empty or unoccupied. Therefore, 10 cm3 of the actual volume is occupied by water molecules present in 20 cm3 of water