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Question

Each drop of H2O has 0.018 ml at room temperature. Number of H2O molecules in one drop is :

A
1×103
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B
6.02×1020
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C
22.4×103
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D
6.02×3×102
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Solution

The correct option is C 6.02×1020
Each drop of H2O has 0.018 ml at room temperature and one mole of water contains 18 g and 6.023×1023 molecules.
Number of H2O molecules in one drop=0.018×6.023×1023/18=6.023×1020 (density of water is 1g/ml).

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