How to Convert From Mole Fraction of a Component to Mass Percent of a Component

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When converting from a mole fraction of a component to a mass percent of a component, you're going to need to make very good use of a specific chemical formula. Convert from a mole fraction of a component to a mass percent of a component 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

Today, I'm going to explain how to convert from a mole fraction into a mass fraction, of a component. So it's 6.022 x 10 to the 23. That's 1 mole. 1 chemical mole. Now when we are talking about a component what we are thinking of is an atom or a molecule and we use the chemical formula to describe that. And that could be, lets talk about some dream substance, it has X in it and it has Z in it. It might have 4 Z's in it. And it has maybe a Q. These are the various atoms that are in this substance, this component. And there's four Z, there's one X and one Q in it. If I have a mole of this substance then I have a mole of Q, I have four moles of Z and a mole of X. So what we would have to do is look up in the periodic table how much mass is in a mole of X. How much mass is in a mole of Z, how much mass is in a mole of Q? Lets suppose my substance, X, has, you look up the table and it says 12 grams per mole. Okay. Now my substance Z might have 1 gram per mole. And I have four of them. So I have four x 1 = 4. And my substance Q might very well have 16 grams per mole. So whereas I have in here 6 different atoms. Four Zs, one Q, and one X. So I have, as a mole fraction, I have 1/6 X, 1/6 Q, and 4/6 or 2/3 Z. That would be the mole fractions of each of these substances. To get gram fractions I would have to add up first of all how many grams do I have in a mole of this substance and that is 32 and so now I can work out the gram fraction of X is 12/32, of Z 4/32, and of Q I would have 16/32. And this of course you would need to know in percentages or in fractions, 0.5, this is equal to 1/8 or 0.125 and this is equal to 3/8 and that is 0.375. These are the mass fractions of each of these components.


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