Answer:
2.99×10⁻²³ g. Option a
Explanation:
Water → H₂O
We determine the molar mass of water → 1 g/mol . 2 + 16g/mol . 1 = 18g/mol
The molar mass means that 1 mol of water weighs 18 g.
We know that 1 mol contains 6.02×10²³ molecules. Therefore we would make a rule of three:
6.02×10²³ molecules of water weigh 18 g
1 molecule of water may weigh (1 . 18) / 6.02×10²³ = 2.99×10⁻²³ g
