How many molecules are in a 0.1 g water drop?
| July 16, 2021 | education
A water molecule is made up of two oxygen atoms and one oxygen atom.
The molar mass of water is 16 + 1 * 2 = 18 grams / mol
Determine the molar amount of a substance in 0.1 grams of water: 0.1 / 18 = 0.0056 mol
1 mole of a substance contains 6.022 * 10 to the 23rd degree of molecules (this is Avogadro’s constant)
0.0056 mol of water contains 0.056 * 6.022 * 10 to the 23rd power = 0.0337 * 10^23 = 3.37 * 10^21 molecules.
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