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urgent enthalpy of formation and combustion

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befuzzled!! | 23:43 Mon 09th Feb 2009 | Science
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i'm doing AS chemistry btu last lesson teacher was off and so was given the work with homework to do for next lesson but i have no idea what i'm doing
i know the meaning of them but i don't know how tto calculate them :S
please help urgently if anyones awake
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if you';r stuck in the snow and didn't get to school today then have a look at this

http://en.wikipedia.org/wiki/Standard_enthalpy _change_of_formation

Hess' Law is perhaps the most important point.

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