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Hess's law states:
The enthalpy change of a reaction will always be the same regardless of the route taken.
Enthalpy of formation:
1) Direction of the arrows?
2) The elements and reactants/products?
3) To get the enthalpy change?
1) Upwards from the elements.
2) Must be balanced.
3) Form a cycle to get the enthlpy value.
2) All substances?
1) Downwards towards CO2 & H2O.
3) Form a cycle.
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