[Does so]

How many molecules in a glass of water?

[alexander_busek]

How many molecules in a glass of water?

The so-called "molecular weight" of H₂O is approx. 18 grams. That means that 18 grams of water contains one mole of water. A mole is defined as 6.022 x 10²³ particles (molecules) of a substance.

So say that a glass of water typically holds 180 milliliters of water. That would be 6 trillion trillion molecules.

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