Hess’s law and Hess cycles Flashcards
1
Q
Hess’s law states that…
A
If a reaction can be carried out by 2 different pathways then the total enthalpy change for these 2 pathways are equal
2
Q
Why is Hess’s law useful?
A
If we cannot measure the enthalpy change for a reaction directly due to not taking place in standard conditions we can measure enthalpy change of alternative pathway
3
Q
What are these questions usually focused around?
A
Finding standard enthalpy change of reaction using standard enthalpy changes of formation
Finding standard enthalpy change of formation using standard enthalpy changes of combustion