Question

number of water molecules in the drop of water,if 1 ml of water has 20 drops

Answer 1

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Molarity of water is 55.49 M. So it's 55.49 moles in 1 L of water. Now, 1 ml will have 55.49/1000 = 55.49 millimoles of water.

Now, 1 mmol = 6.022 x 10^20 molecules of water.

So 1 ml contains 55.49 x 6.022 x 10^20 molecules of water.

And therefore, 1 drop = 1/20 ml contains [55.49/20] x 6.022 x 10^20 molecules of water.

Final Answer: 16.708039 x 10 ^22 molecules of water.

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