Coursework.Info - Inspiration in an Instant

On the left is an image preview of every page of this document, and below are the first 150 words with formatting removed:

Chemistry coursework My aim is to find the molar heat of combustion of ethanol, propanol and butanol .I will also be comparing the experimental molar heat of combustion with the theoretical, using bound enthalpy's. Background information I have found some information that will help me with my experiment. This text is all from www.webchem.net The complete combustion of propane can be represented by the following equation: or we could redraw it to represent the bonds present: We now need to work out how many of each bond type we have broken. 8xC-H 2xC-C 5xO=O And then how many bonds have been formed! 6xC=O 8xH-O So using data tables we can look up then average bond enthalpies from, and calculate the enthalpy change of the reaction. Bond Type Average bond enthalpy /kJ mol-1 C-H +413 C-C +347 O=O +498 C=O +805 H-O +464 Notice they are all endothermic. So we can now do the sum, remember, sum of bonds broken - sum of bonds formed. ?Hr°= [(8x413)+(2x347)+(5x498)] - [(6x805)+(8x464)] ...

To see the full version of this document, and 145,841 others