How to Convert Moles to Mass in Chemistry

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Converting moles to mass in chemistry will require you to make good use of a very particular equation. Convert moles to mass in chemistry with help from an experienced educator in this free video clip.

Part of the Video Series: Chemistry & Physics
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Video Transcript

Hello, my name is Walter Unglaub, and this is how to convert moles to mass in chemistry. So, if we have a number of moles, n, and we want to convert that to mass, we have to multiply by Avagadro's number, and the mass of one of the constituent particles of our total mass that we want to calculate. So, unit wise, this has units of moles. Avagadro's number has units of particles per mole. And finally, m has units of kilograms per particle. So, when we multiply these three together, we see that the units of moles cancels out, as does the unit of particles, and we're left with mass, kilograms. So this is going to be my total mass. So let's say I want to consider 1 mole of oxygen atoms. The mass of a single oxygen atom in kilograms is approximately 2.68 times 20 to the negative 26 kilograms, and if I'm considering just 1 mole, my capital N is going to be equal to 1. Avagadro's number is a universal constant, and it is equal to approximately 6.022 times 10 to the 23rd inverse moles, or particles for mole if you want to use that interpretation. So using this equation then, we simply multiply N with N sub A with M. So when we multiply these three numbers together, we get at the end of the day a total mass of approximately .016 kilograms, which is equal to 16 grams of oxygen. My name is Walter Unglaub, and this is how to convert moles to mass in chemistry.


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