Question

plzzz help me frnds in this queee it's so important.

Answer 1

1 mole (18 grams) of H₂O contains Avogadro number of molecules
                                                    → 6 x 10²³ molecules

so, 6 x 10²³ molecules of H₂O weigh 18 grams
then, 1 molecule of H₂O will weigh 18/(6 x 10²³) = 3 x 10⁻²³ grams

Therefore 3 x 10⁻²³ grams is the weight of 1 molecule of water.

Hence, Volume occupied by it = weight/density = 3 x 10⁻²³/1 = 3 x 10⁻²³ cm³


The volume occupied by 1 molecule of H₂O is 3 x 10⁻²³ cm³