Logged out
Access All our Essays in an Instant
Swap your work for FREE access, or pay £4.99 for instant access
Comparing the Enthalpy Changes of Combustion of Different Alcohols
Member rating:
(1 vote)
| Words:
| Submitted: Tue Aug 05 2003
Page Preview
On the left is an image preview of every page of this document, and below are the first 150 words with formatting removed:
Comparing the Enthalpy Changes of Combustion of Different Alcohols By Steven Duong Background Information The enthalpy change of the combustion of a fuel depends on two things. First, there is the number of bonds to be broken and made - and that depends on the size of the molecule involved. The ?H?c also depends on the type of bonds involved: e.g. combustion of a) methane and b) methanol a) CH4 + 2O2 CO2 + 2H2O H O=O O=C=O H-O-H O=O H-O-H H C H H b) CH3OH + 11/2O2 CO2 + 2H2O H O=O O=C=O H-O-H O H-O-H H C O - H H From the examples shown above, the products are the same, but the key difference is that methanol already has an O-H bond; one of the bonds to oxygen is already made, unlike with methane, where all the new bonds have been made. The energy released during combustion comes from the making of...
To see the full version of this document, and 145,345 others
