Enthalpy of Freezing

[Samantha Kan 2L]

Is the symbol for enthalpy of freezing -∆Hfus or is there another symbol we should use?

[Kaelie Blanes-Ronda 2L]

I think its the same symbol for both freezing and melting which is ∆Hfus. It's just freezing is from liquid to solid so the value is negative because the reaction is exothermic (-∆Hfus) where as melting is endothermic (+∆Hfus).

[Rana YT 2L]

That is correct but the negative is arbitrary since it depends on the direction of the phase change

[Anne 2L]

Sorry if I'm totally off, but wouldn't the negative sign be required and not arbitrary in this case. I believe freezing is the reverse reaction of melting/fusion. Since melting/fusion is endothermic and therefore has a positive enthalpy value, wouldn't freezing be exothermic and therefore have a negative enthalpy value?

[Kyle Sheu 1C]

Yep, that's right! I think Kaelie made a small error in her 1st statement, but everything else is correct.