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Question

The density of water is 1 g/ml. The volume of water drop is 1.8 ml. The number of molecules present in one water drop is:

A
6.023×1023
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B
6.023×1021
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C
3.011×1011
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D
6.023×1022
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Solution

The correct option is D 6.023×1022
From density, it can be said that 1 g of water has volume of 1 ml.
Thus, 1.8 ml of water has mass of 1.8 g.
1 mole of water weighs 18 g.

Thus, 1.8 g of water corresponds to 0.1 mole.
1 mole of water contains 6.023×1023 molecules.
Hence, 0.1 mole of water will contain 6.023×1022 molecules.

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