on the traingle diagrams, the arrows point in different directions in accordance to what the reaction is. can you tell me what directions they go in or link me to a GOOD site about it :S
also, if you go the oposite way to an arrow do you minus that bond enthalpy?
Answer:
hess's law basically says it doesn't matter what route you take the enthalpy change will be the same(as long as the start and end conditions are).
so if you have enthalpies of combustion or formation you can make a triangle where you either form all the chemicals of combustion them all.
e.g
Δf(CuO)+Δf(AgNO3)+Δh=
Δf(Cu(NO3)2)+Δf(Ag2O)
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