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Mole conversions


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#1 SophiaRivera007

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Posted 6 February 2017 - 07:03 AM

I have question regarding moles conversion. What are the mole conversion formulas involving grams & formula units?


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#2 AshBox

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Posted 6 February 2017 - 07:32 AM

Find conversions using this equations:

 

 

MOLES TO GRAMS (moles --> grams)*

Mol Substance x Molar Mass Substance

 

GRAMS TO MOLES (grams --> moles)*

Mass (g) Substance x 1 mol substance

 

FORMULA UNITS TO GRAMS (formula units --> moles --> grams)*

Formula Units x 1 mol ----------------- x -------------- Molar mass (g)
---------- Avogadro's number (formula units) ----------- 1 mol

 

GRAMS TO FORMULA UNITS (grams --> moles --> formula units)*

---Mass substance (g) x 1 mol substance ------ x ----- Avogadro's number
------------------------ Molar Mass (g) substance ----------- 1 mol substance


Edited by AshBox, 6 February 2017 - 07:33 AM.

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#3 Bender

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Posted 6 February 2017 - 11:23 AM

Find conversions using this equations:

 

 

GRAMS TO MOLES (grams --> moles)*

Mass (g) Substance x 1 mol substance

I think you mean:

mole substance = mass / molar mass


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#4 hypervalent_iodine

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Posted 6 February 2017 - 11:59 AM

I think you mean:
mole substance = mass / molar mass


What they wrote amounts to the same thing, it's just a rearrangement (albeit not very clearly written).
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#5 AshBox

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Posted 8 February 2017 - 07:30 AM

I think you mean:

mole substance = mass / molar mass

It is clearly written how to find moles in gramm. what you said is also the same thing.


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#6 Bender

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Posted 8 February 2017 - 07:56 AM

I might be confused with the terminology in English (not my native language). Is what you mean by "mol substance" the same as "1/(molar mass)" and has it a unit of mol/g?


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#7 hypervalent_iodine

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Posted 8 February 2017 - 09:38 AM

I might be confused with the terminology in English (not my native language). Is what you mean by "mol substance" the same as "1/(molar mass)" and has it a unit of mol/g?

No, he means moles. The equation he gave in his initial post was moles to grams, ie. Where you have the number of moles and wish to convert it to grams.

If,

n=mass / molar mass

Then,

Mass = n x molar mass

The latter equation is what he wrote out. It was a little weirdly worded, which could be the source of your confusion.
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#8 Bender

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Posted 9 February 2017 - 11:10 AM

The second equation he gave, and the one I commented on, was grams to moles and he wrote

 

mass x n

 

assuming "mol substance" is the same as "the number of moles". This still doesn't make sense to me. My confusion remains.


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#9 hypervalent_iodine

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Posted 9 February 2017 - 11:43 AM

The second equation he gave, and the one I commented on, was grams to moles and he wrote
 
mass x n
 
assuming "mol substance" is the same as "the number of moles". This still doesn't make sense to me. My confusion remains.


I stand corrected. I read their post, but only looked at the first equation and not the one you actually responded to. You're correct, and it is wrong. The subsequent equations are also quite confusing.
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#10 Bender

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Posted 9 February 2017 - 10:26 PM

Thank you for clearing that up.


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