Eremor
Badges: 9
Rep:
?
#1
Report Thread starter 5 years ago
#1
Hey.

So I have a question that required me to calculate the energy to make a cup of coffee from ice initially at -40 degrees. So I calculated the Energy to raise the ice to water at 100 degrees (Including the heat of fusion to melt the ice) but I have an issue.

Do I need to include the energy required to boil the water, i.e The Latent Heat of Vaporisation? The questions asks for the energy required to make the coffee and as you obviously dont want to evaporate the water then surely you dont need to include this energy?

I just ask as the question gives the required information to calculate this but I dont think its needed, probably just there to throw me off.

Thanks
0
reply
alow
Badges: 19
Rep:
?
#2
Report 5 years ago
#2
(Original post by Eremor)
Hey.

So I have a question that required me to calculate the energy to make a cup of coffee from ice initially at -40 degrees. So I calculated the Energy to raise the ice to water at 100 degrees (Including the heat of fusion to melt the ice) but I have an issue.

Do I need to include the energy required to boil the water, i.e The Latent Heat of Vaporisation? The questions asks for the energy required to make the coffee and as you obviously dont want to evaporate the water then surely you dont need to include this energy?

I just ask as the question gives the required information to calculate this but I dont think its needed, probably just there to throw me off.

Thanks
Nah, you don't.

What temperature should coffee even be? It definitely shouldn't boil off though.
0
reply
Eremor
Badges: 9
Rep:
?
#3
Report Thread starter 5 years ago
#3
(Original post by alow)
Nah, you don't.

What temperature should coffee even be? It definitely shouldn't boil off though.
The question asks for 100g of water at 100 degrees. So Yeah I assume its not needed.
0
reply
alow
Badges: 19
Rep:
?
#4
Report 5 years ago
#4
(Original post by Eremor)
The question asks for 100g of water at 100 degrees. So Yeah I assume its not needed.
Yeah that wouldn't include vaporisation or there would be no coffee left :lol:
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Do you have the space and resources you need to succeed in home learning?

Yes I have everything I need (418)
56.56%
I don't have everything I need (321)
43.44%

Watched Threads

View All
Latest
My Feed