Question

A big drop has volume 1.0 mL. How many molecules of water are there is this drop, If the density of water is 1g/mL?

  • Atoms and molecules CBSE Class 9
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Answer

Volume of drop of water = 1.0 mL

Density of water = 1.0 g/mL

∴ Mass of drop of water = Volume × Diabesity = 1.0 g

Molecular mass of H2O = 2 × 1 u + 1 × 16 u = 18 u

Gram molecular mass of water = 18 g/mol

18 g of water contains = 6.022 × 1023 molecular

∴ 1 g of water contains = (6.022 × 1023 / 18) molecular

= 3.34 ×1022 molecules.

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