## Brainteaser

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• Here s an exercise for all the budding chem. engineers out there. Estimate the amount of heat energy needed to raise the temperature of 20 g of common alcohol
Message 1 of 3 , Apr 30, 2006
Here's an exercise for all the budding chem. engineers out there.

Estimate the amount of heat energy needed to raise the
temperature of 20 g of common alcohol (ethanol) contained in a
100g glass jar from 20°C to 30°C.

Slainte!
regards Harry
• 316 calories if the specific heat of glass is .20 and the specific heat of ethanol is .58 Kim ... From: Harry To:
Message 2 of 3 , Apr 30, 2006
316 calories if the specific heat of glass is .20 and the specific heat of
ethanol is .58

Kim
----- Original Message -----
From: "Harry" <gnikomson2000@...>
To: <new_distillers@yahoogroups.com>
Sent: Sunday, April 30, 2006 9:36 AM
Subject: [new_distillers] Brainteaser

Here's an exercise for all the budding chem. engineers out there.

Estimate the amount of heat energy needed to raise the
temperature of 20 g of common alcohol (ethanol) contained in a
100g glass jar from 20°C to 30°C.

Slainte!
regards Harry

New Distillers group archives are at http://archive.nnytech.net/
FAQ and other information available at http://homedistiller.org

• ... Since you re specifying the glass jar, I d have to include the energy needed to heat up the glass. The answer is therefor indeterminate, unless you give
Message 3 of 3 , Apr 30, 2006
--- In new_distillers@yahoogroups.com, "Harry" <gnikomson2000@...>
wrote:
>
> Here's an exercise for all the budding chem. engineers out there.
>
> Estimate the amount of heat energy needed to raise the
> temperature of 20 g of common alcohol (ethanol) contained in a
> 100g glass jar from 20°C to 30°C.
>

Since you're specifying the glass jar, I'd have to include the
energy needed to heat up the glass. The answer is therefor
indeterminate, unless you give me the total mass of the glass jar.
Or, at least give me the thickness of the glass, it's shape and
dimensions and I'll figure it out. Is it a cylinder of equal height
and diameter? Is it a sphere? What kind of glass? Heck, what
concentration of ethanol - 95%?

Go raibh maith agat

RR
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