How to Convert Moles of O2 to Mass in Grams

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Converting from moles of O2 to mass in grams is something you can do with a very specific equation. Convert moles of O2 to mass in grams with help from a research scientist and one of the world's leading experts on star formation in this free video clip.

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Video Transcript

Hello, my name is Harold Yorke. I'm a research scientist in Pasadena, California, and I'm going to explain how to convert moles of oxygen into grams.We're talking about a chemical term that means a certain number of substance. In this case the certain number is how many 02 molecules do we have. So that number is 6022. Now I would have to continue with another 20 zeroes to display this number and I'm not sure if this whiteboard has enough space. So, I'm going to use scientific notation. 6.022 x 10 to the 23. So there are 6.022 x 10 to the 23 molecules in a mole of that particular molecule. The second term I have to define is 02 and I think I've already divulged what it is. 02 is the oxygen molecule, which consists of 2 atoms of oxygen that are bound together. The third term I have to define is gram. What is a gram? A gram is a metric unit, obviously, and it's defined, believe it or not, as 1/1000 of a kilogram. So it's one kilogram divided by 1000. Now somewhere locked up in a cabinet they have a 1 kilogram mass, which is the standard, and people have to use that as their standard. Now the question is, if we have a mole of oxygen gas, how many grams of oxygen gas would be have. And so lets figure out, first of all a mole means that we have this number of molecules. And the definition of a mole is actually the number of carbon atoms in 12 grams of carbon 12. So carbon 12 is a atom that has 6 protons and 6 neutrons in the nucleus and 6 electrons in the outer cloud, electron cloud. That is 12 grams of carbon has exactly this number of carbon atoms. We need to find out what is the atomic weight of oxygen. We know the atomic weight of carbon, it's 12. We would look that up in a table called the periodic table and look as where oxygen is. And we will find the number, I'm rounding up, it's 16. 16 grams per mole of 0. but we have two of them. So we have to multiply 16 by 2 and the answer of this, there's 32 grams of oxygen in a mole of oxygen. So there's 32 grams per mole. And that's the answer to our question.


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