Entropy

[Drishti_Jain_1D]

Is there anyway to obtain the change in entropy when only change in enthalpy is known? Is there a derivation in which this would be possible, or do you just assume change in enthalpy acts like a heat (q)?

[Jerry Wang 1L]

Hi,

To my knowledge, it is not possible to get entropy change from only the enthalpy change. Temperature must be known. If we look at the units, this is already telling because entropy is in J/K while enthalpy is in J (or kJ). q often is the enthalpy change, of which when we divide by temperature, we will get the change in entropy.

[Vincent Tse 2B]

At constant pressure, the change in enthalpy will be equivalent to heat (qp).