What is the no. of molecules in a drop of water weighing 0.05g.?

Dear Student

 

One drop of water has the weight = 0.05 g. 

 

The molar mass of water (H₂O) is 18.0 grams/mol (1.008 + 1.008 + 16.0).

 

This means there is one mole of water in 18.0 grams. One mole is 6.02 × 10²³ molecules.
Then the number of atoms in 0.5 g:
0.05 grams ÷ 18.0 grams × (6.02 × 10²³ molecules)= 1.67 × 10²² molecules

 

We hope that clarifies your query.

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