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Author Topic: How do I calculate the amount of ethanol in a bottle of 12.5% strength wine?  (Read 6977 times)

Offline thegers91

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hi there, been doing a chemistry investigation in to the ethanol in wine.

i have a result for the ethanol content in moll-1

but im struggling to calculate what the average amount of ethanol in 12.5% 750 ml bottle to compare my result

any help into getting an answer would be greatly appreciated
« Last Edit: 27/04/2009 22:09:43 by chris »


 

Offline lightarrow

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hi there, been doing a chemistry investigation in to the ethanol in wine.

i have a result for the ethanol content in moll-1

but im struggling to calculate what the average amount of ethanol in 12.5% 750 ml bottle to compare my result

any help into getting an answer would be greatly appreciated
If you made a little effort in trying to solve it...we could help you; making homeworks for you is not exactly correct.
 

Offline Chemistry4me

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I don't understand what you are trying to calculate. Anyway, have a go at it first!
 

Offline Yomi

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Hey what is this all about %% ???
 

Offline lightarrow

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I don't understand what you are trying to calculate. Anyway, have a go at it first!
I think he simply want to compute the molar concentration of ethanol in water, knowing the weight concentration.
 

Offline Bored chemist

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I think he's after the concentration in moles/litre
Now, in scientific journals I'm quite happy to see that written as M.L-1
but on a website it's likely to get messed up, particularly if the superscripting doesn't work.

Incidentally, it's not as trivial a question as it looks.
You need to be able to convert %v/v to %m/v then convert %m/v to g/l then turn that into moles/litre.
Not rocket science; none of the steps is difficult, but it's easy enough to miss out a stage.
Also someone has thrown a red herring into the data.
 

Offline lightarrow

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I think he's after the concentration in moles/litre
Now, in scientific journals I'm quite happy to see that written as M.L-1
but on a website it's likely to get messed up, particularly if the superscripting doesn't work.

Incidentally, it's not as trivial a question as it looks.
You need to be able to convert %v/v to %m/v then convert %m/v to g/l then turn that into moles/litre.
Not rocket science; none of the steps is difficult, but it's easy enough to miss out a stage.
Also someone has thrown a red herring into the data.
If the data are in v/v then he should know the densities of the mixes water-ethanol.
 

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