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Enthalpy (Hess cycles (If the question gives you then enthalpy change if…
Enthalpy
Hess cycles
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If the question gives you then enthalpy change if formation then the arrows of the Hess cycle must go up from the formation products
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If the question gives you the enthalpy change of combustion then the arrows of the Hess cycle must go downwards.
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Hess' law: If a reaction can take place by two routes and the starting and finishing conditions are the same, the total enthalpy change is the same for each route.
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Enthalpy change is represented by a triangle then a H the triangle representing change and the H representing Enthalpy
in formation Hess cycles the lone elements have an enthalpy value of 0 because they are elements not compounds
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