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:

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

How old are you guys? i need help on coursework!

Just post your questions, doesn't matter how old or young someone is, you hopefully will be getting what help you need. :D

Cheers,
Opuntia

can I ask why the enthalpy is also different in the same alcohol group?