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I am a little unsure of what the term "+VE" (Course reader Pg 17) means. Also, if VE+ is the result of endothermic reactions, could the term change to be negative in the case of exothermic state changes (e.g. freezing/condensation/deposition), or does state change only yield a positive VE+ result?
I don't know what VE stands for, but it is true that VE means energy. As can be seen from the first equation, Delta H(vap) does yield positive value since there must be an input of energy(+VE) to the substance. And yes, if the process was backward - vapor to liquid - then it would be exothermic and it would have -(negative) VE value.
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