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CBSE Class 9 Answered

What is the no. of molecules in a drop of water weighing 0.05g.?
Asked by ananya vyas | 08 Feb, 2011, 10:12: AM
Expert Answer
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.
Regards
Team
Topperlearning
Answered by | 09 Feb, 2011, 12:25: PM
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