## Entropy

$\Delta S = \frac{q_{rev}}{T}$

Drishti_Jain_1D
Posts: 22
Joined: Fri Jul 22, 2016 3:00 am

### Entropy

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
Posts: 10
Joined: Fri Jul 22, 2016 3:00 am

### Re: Entropy

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
Posts: 30
Joined: Fri Jul 22, 2016 3:00 am
Been upvoted: 3 times

### Re: Entropy

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