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How many molecules are in a drop of water?


There are 1.67 x 1021 or 1.67 sextillion water molecules in a drop of water. There are three atoms per water molecule. Find the number of atoms in a drop of water by multiplying this number of molecules by 3. There are 5.01 x 1021 or about 5 sextillion atoms in a drop of water.

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