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Old February 5th, 2006, 11:28
chemconfused chemconfused is offline
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Default comparing enthalpy change of combustion of different alcohol
:? Im having difficulty identifying how enthalpy change of combusion is affected by their molecular structure. the results i have are shown as follows:

Methanol –
-316.24 kJmol-1
Ethanol –
-910.0 kJmol-1
Propan-1-ol –
-733.98 kJmol-1
Butan-1-ol –
-1077.03 kJmol-1

as you can see there is some anomalies but can anyone help me with the pattern ? i think that ethanol is an anomalie and they should increase but can anyone help me with a more scientific explanation?
many thanks
R :wink:
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Old February 8th, 2006, 23:51
Shadow Shadow is offline
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you just have to use bond enthalpy. Methane is CH4 so there are 4 C-H bonds.In Ethane ther are 6 C-H bonds and a C-C bond so enthalpy is greater.Get it?they just keep getting bigger the more bonds you have to break
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Old April 26th, 2006, 05:57
Tom Tom is offline
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How old are you guys? i need help on coursework!
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Old April 27th, 2006, 11:46
opuntia opuntia is offline
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Just post your questions, doesn't matter how old or young someone is, you hopefully will be getting what help you need.

Cheers,
Opuntia
  #5  
Old May 18th, 2006, 04:43
Monique_ho Monique_ho is offline
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can I ask why the enthalpy is also different in the same alcohol group?
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