## Entropy

$\ln K = -\frac{\Delta H^{\circ}}{RT} + \frac{\Delta S^{\circ}}{R}$

Rhea Shah 2F
Posts: 97
Joined: Thu Jul 25, 2019 12:17 am

### Entropy

Can we use the van't hoff equation to calculate entropy, or would we use a different equation to calculate entropy over a temperature change?

Chris Tai 1B
Posts: 102
Joined: Sat Aug 24, 2019 12:16 am

### Re: Entropy

This depends on which form of the Van't hoff equation you're using. You can use the van't hoff equation to indirectly solve for the enthalpy of a reaction over a given temperature range, since the equation relates two different equilibrium constants at two different temperatures with there being a factor of deltaH/R.
However, you could also use the form of the equation that relates one equilibrium constant to a reaction at a singular temperature, in which you're also able to solve for the entropy at that given temperature.
ln(K) = -deltaH/RT + deltaS/R

Ayushi2011
Posts: 101
Joined: Wed Feb 27, 2019 12:17 am

### Re: Entropy

I would calculate deltaH and then use deltaG = deltaH - TdeltaS to find entropy.