How to Find the Mass of One Molecule of Water (H2O)

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2 жыл бұрын

There are two steps to find the mass of a single molecule of Water (H2O). First we find the molar mass for Methane using the Periodic Table. We then divide this by Avogadro's Number (6.02 x 10^23).
To find the molar mass for H2O we add up the atomic masses of the individual atoms in the Water molecule. Once we have the molar mass for Methane we can divide by Avogadro's Number to find the mass of a single molecule of Water .
You should check your answer to make sure it makes sense. Since molecules are very, very small you should get a very small number as your answer.
Note that this is the mass for a single molecule of Water (H2O). In reality electronic balances are not able to measure the mass of one single molecule at a time due to their small size.
For help with molar mass and chemical quantities, the following videos may be helpful:
• More Moles to Grams Practice: • Practice: Converting b...
• Molar Mass in Three Easy Steps: • How to Calculate Molar...
• Understanding the Mole: • Understanding the Mole...
• Moles - Gram Conversions: • Practice: Converting b...
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• Mole Ratio: • How to Find the Mole ...
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My chemistry website: www.Breslyn.org

Пікірлер: 8

@zaraahmadzai768 9 ай бұрын

i just dont understand why you have to divide it by avogadros constant

@monsieurlambertz7706 2 ай бұрын

By dimensional analysis, to obtain mass from 18.02 g/Mol, we need to multiply by 1 Mol. However, 1 Mol is equivalent to the avogadro number, which in this case can be considered as the number of h2o molecules. Therefore, we're kind of diving 18.02 g by the number of water molecules we got, so we have the mass per molecule.