Alkanols and alkanes

[thisongaintgottaname]

both alkanols and alkanes burn at SLC to produce carbon dioxide and water. Using the info in the data book, answer the following:
Explain which group of compounds has a higher molar enthalpy of combustion and why?

could somebody pls explain this? thanks!!

[Potter]

If you look at both molecules at a molecular level, say for instance propane and propanol respectively
CH3CH2CH3  and CH3CH2CH2OH

Basically, with the propanol you have a R-OH. That added C-O bond has a lot more energy in comparison to your C-H Bond found in typical alkanes.

Therefore, alkanols produce more energy when burnt.