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What is the difference between molar entropies and standard entropy of formation? Why do we use molar entropies to find the standard reaction entropies and not standard entropies of formation?
The entropies that we use in the back of the book (the molar entropies) are inherently standard, which is indicated by the little degree sign. We use standard molar entropies so that we can use the same number to calculate the standard entropy of many reactions.
Molar entropy is the entropy content of one mole of substance under a standard state, and it is absolute. Normally, we only use enthalpy of formation and you will not see entropy of formation
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