![oxygen atomic mass oxygen atomic mass](http://3.bp.blogspot.com/-b8EbTNfrcLw/TvPOYb5cAHI/AAAAAAAAAC4/XXae1rZA7cE/s1600/Oxygen.jpg)
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![oxygen atomic mass oxygen atomic mass](http://2.bp.blogspot.com/-NSBY9ufoC4c/UDab6g7KHCI/AAAAAAAAAR0/EyUlD1mSQOw/s1600/photo%2B-%2Boxygen.jpg)
This is approximately one atom of oxygen. To visualize this, when you take 1 gram of oxygen, divide it into trillion equal parts and then take one part and then divide it again into trillion equal parts, and then get three parts. When we divide the mass of a mole of oxygen by Avogadro’s number, we get the mass of an oxygen atom in grams.
![oxygen atomic mass oxygen atomic mass](https://www.middleschoolchemistry.com/img/content/multimedia/chapter_4/lesson_3/oxygen_atom.jpg)
In 1910, Robert Millikan with his Oil drop experiment calculated the value for Avagadro’s number as 6.022x10²³. It was actually in 1909, Jean Baptiste Perrin, a French physicist, in his paper ‘Brownian Movement and Molecular Reality’ provided theory for existance of this number and proposed it should be called Avagadro’s number. But how many atoms/molecules are there in a mole of an element/compound? If you guessed 6.022x10²³, then… you are absolutely right! This number is called the Avogadro’s number. Now, if we somehow know the amount of atoms in a mole, then by dividing the mass of the mole by the number of atoms contained in it will yield the mass of a single atom. When using the mole, which relies on mass, you don’t need to maintain these conditions, which is why chemists use the mole.
![oxygen atomic mass oxygen atomic mass](https://1.bp.blogspot.com/_AY0JYgVciGA/S7Y26s9CruI/AAAAAAAAADk/IGMsLC01Gxk/s1600/Oxygen3.jpg)
You need to maintain the same temperature and pressure. If you are wondering why chemists don’t use volume as a measure for the amount, for example, why couldn’t you make 2 litres of water with 2 litres of hydrogen and 1 litre of oxygen. For example, based on the balanced chemical equation 2H₂ + O₂ → 2H₂O they can say that to make 2 moles of water you need 2 moles of hydrogen and 1 mole of oxygen. Mole makes the calculations simple for chemists to find out the amount of raw materials needed to make a compund.
Oxygen atomic mass how to#
Well, let’s learn about the different types of atomic mass and then understand how to find the atomic mass for a single atom! But what if you were asked to find the atomic mass, in grams, for a single atom of oxygen? What is the equivalent of 1 amu in grams. In the periodic table the atomic mass of oxygen is listed as 15.99 in amu (atomic mass unit). If you were asked to find the atomic mass for oxygen, what would you do? Well, you would probably look at the periodic table.