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How big is a drop?

"A drop" is not a precise measurement. It depends on a number of factors.

If you measure how big the drops of water are you're talking about, (in millilitre)

then you could figure out the number of molecules based on the fact that Avogadro's number of water molecules have a volume of about 18 milliliters.

Avogadro's number is 6.022 * 1023 (particles) per mole

One drop: average volume about 0.05 ml = 0.05 g

Molar mass of water 18.01 g/mol

Meaning: about 1.7*1021 molecules in a drop of water: don't start counting them!!

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14y ago
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12y ago

2x10 to the 21. That's if you assume the water has a density of 1.00g/cm squared

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Q: A drop of water has a volume of 0.05mL how many water molecules does it contain?
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