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How do you know when a compound is in its purest form, aka when it won't impact enthalpy change?
A compound is in its purest form when it is in its most stable form. An example of this is O2 which has an enthalpy of formation of zero because it is the most stable form of oxygen, whereas O3 would have an enthalpy of formation that was not equal to zero. Generally, gases are in their most stable form but a substance like carbon can be in its most stable form as solid graphite.
To add on, the most stable forms won't affect enthalpy change only when calculating the enthalpy of formation.
Can you assume that inert gasses wouldn't affect enthalpy calculations then?
I believe Dr Lavelle gave a list of gases that are in the purest form (O2, N2, etc). I think there should be a list in the textbook.
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