How many molecules are present in 9 grams of water (H₂O)? (Molar mass of H₂O = 18 g/mol, Nₐ = 6.02 × 10²³)
- 3.01 × 10²²
- 3.01 × 10²³
- 6.02 × 10²³
- 1.20 × 10²⁴
📝 Batafsil tushuntirish
Moles = mass / molar mass = 9g / 18g/mol = 0.5 moles.Number of molecules = 0.5 × 6.02 × 10²³ = 3.01 × 10²³.