chemistry - heat of combustion - modifications

Watch
2F0L0Y2
Badges: 5
Rep:
?
#1
Report Thread starter 2 years ago
#1
Would changing the fuels used be an extension or a refinement of the original experiment?

original experiment used only ethanol
modified experiment will use octanol, propanol and butanol.
0
reply
David Tan
Badges: 7
Rep:
?
#2
Report 2 years ago
#2
(Original post by 2F0L0Y2)
Would changing the fuels used be an extension or a refinement of the original experiment?

original experiment used only ethanol
modified experiment will use octanol, propanol and butanol.
I doubt so. The main source of error or discrepancy between experimental combustion enthalpy and theoretical combustion enthalpy values comes from significant heat loss to the surrounding. These error sources could be due to a) incomplete combustion of fuel, b) rapid loss of fuel due to evaporation especially immediately after the flame is extinguished, c) heat loss from flame due to draught and/or d) heat capacity of calorimeter was not taken into consideration etc.

By using a fuel that is less volatile, there is lesser chance of having a "rapid loss of fuel due to evaporation especially immediately after the flame is extinguished". However, the drawback of using a less volatile fuel (in this case, octanol) is that the problem of incomplete combustion is a more serious one.

Hope it helps. Cheers.
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

Are you tempted to change your firm university choice on A-level results day?

Yes, I'll try and go to a uni higher up the league tables (20)
28.17%
Yes, there is a uni that I prefer and I'll fit in better (7)
9.86%
No I am happy with my choice (40)
56.34%
I'm using Clearing when I have my exam results (4)
5.63%

Watched Threads

View All