Question

Calculate the number of molecules in a drop of water weighing 0.02g

Answer 1

No. of molecules = given mass in gram/molecular weight × N•

Here ;

● Molecular weight of water(H2O) =

(1×2) + (16×1)

= 18 g

● Given mass = 0.02 g

● N• = 6.023 × 10^23

No. of water molecules = (0.02/18) × 6.023 × 10^23

= 669,222,222,222,222,222,222.22222222222

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Answer 2

Answer:

Explanation:

Molecular weight of water(H2O) =

(1×2) + (16×1)

= 18 g

● Given mass = 0.02 g

● N• = 6.023 × 10^23

No. of water molecules = (0.02/18) × 6.023 × 10^23

= 669,222,222,222,222,222,222.22222222222