# The Naked Scientists Forum

### Author Topic: How do I calculate the amount of ethanol in a bottle of 12.5% strength wine?  (Read 6882 times)

#### thegers91

• Jr. Member
• Posts: 19
##### How do I calculate the amount of ethanol in a bottle of 12.5% strength wine?
« on: 19/04/2009 16:21:35 »
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 »

#### lightarrow

• Neilep Level Member
• Posts: 4586
• Thanked: 7 times
##### Re: How do I calculate the amount of ethanol in a bottle of 12.5% strength wine?
« Reply #1 on: 19/04/2009 16:35:55 »
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.

#### Chemistry4me

• Neilep Level Member
• Posts: 7709
##### Re: How do I calculate the amount of ethanol in a bottle of 12.5% strength wine?
« Reply #2 on: 20/04/2009 01:03:49 »
I don't understand what you are trying to calculate. Anyway, have a go at it first!

#### Yomi

• Hero Member
• Posts: 548
• HERE IN AM TO TAKE AWAY THE NOBEL PRIZE
##### Re: How do I calculate the amount of ethanol in a bottle of 12.5% strength wine?
« Reply #3 on: 20/04/2009 09:34:35 »
Hey what is this all about %%

#### lightarrow

• Neilep Level Member
• Posts: 4586
• Thanked: 7 times
##### Re: How do I calculate the amount of ethanol in a bottle of 12.5% strength wine?
« Reply #4 on: 20/04/2009 09:45:03 »
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.

#### Bored chemist

• Neilep Level Member
• Posts: 8591
• Thanked: 41 times
##### Re: How do I calculate the amount of ethanol in a bottle of 12.5% strength wine?
« Reply #5 on: 20/04/2009 22:22:39 »
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.

#### lightarrow

• Neilep Level Member
• Posts: 4586
• Thanked: 7 times
##### Re: How do I calculate the amount of ethanol in a bottle of 12.5% strength wine?
« Reply #6 on: 21/04/2009 09:23:12 »
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.

#### The Naked Scientists Forum

##### Re: How do I calculate the amount of ethanol in a bottle of 12.5% strength wine?
« Reply #6 on: 21/04/2009 09:23:12 »

Login
Login with username, password and session length