A Level Chemistry PAG

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winterbear
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Hey can someone help me with the following extension questions from pag 3.3- Determination of an enthalpy change of combustion-
1) Work out the difference between the enthalpy values for each successive member of the alcohol homologous series. WHY IS THE DIFFERENCE A CONSTANT VALUE?
2)PREDICT A VALUE FOR THE ENTHALPY CHANGE OF COMBUSTION OF DODECAN-1-OL
3) WHY ARE THESE CALCULATIONS NOT STANDARD ENTHALPY CHANGES?
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Pigster
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(Original post by winterbear)
Hey can someone help me with the following extension questions from pag 3.3- Determination of an enthalpy change of combustion-
1) Work out the difference between the enthalpy values for each successive member of the alcohol homologous series. WHY IS THE DIFFERENCE A CONSTANT VALUE?
2)PREDICT A VALUE FOR THE ENTHALPY CHANGE OF COMBUSTION OF DODECAN-1-OL
3) WHY ARE THESE CALCULATIONS NOT STANDARD ENTHALPY CHANGES?
1) think about it in terms of a bond enthalpy calculation (sum energy needed to break all the bonds and compare to the energy needed to form the new bonds) if may help to do this for methanol, ethanol etc. and for each structure keep a note of how many bonds (and of each type) break and form.
2) should follow from 1)
3) did you do the experiment under standard conditions?
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