Entropy vs. Enthalpy [ENDORSED]

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

Rakhi Ratanjee 1D
Posts: 59
Joined: Fri Sep 29, 2017 7:04 am

Entropy vs. Enthalpy

What is the direct relationship between entropy and enthalpy. Are they directly proportional?

AnuPanneerselvam1H
Posts: 52
Joined: Fri Sep 29, 2017 7:07 am

Re: Entropy vs. Enthalpy

Entropy is calculated by dividing the heat lost/gained in a reversible reaction divided by the temperature of the system. If this reaction occurs at constant pressure then you can substitute q for delta H, or enthalpy change.

Ivy Lu 1C
Posts: 54
Joined: Thu Jul 27, 2017 3:00 am

Re: Entropy vs. Enthalpy  [ENDORSED]

Change in enthalpy, delta H, is equal to heat loss/gained under constant pressure. If there's constant pressure than in the equation delta S=q/T, q can be replaced by delta H. Under these condition, change in entropy would be directly proportional with change in entropy.