Entropy of Fusion

$\Delta G^{\circ} = -nFE_{cell}^{\circ}$

Tessa Lawler 1A
Posts: 57
Joined: Fri Sep 28, 2018 12:18 am

Entropy of Fusion

When finding the entropy of fusion of water, why do you take the entropy of fusion of the liquid state minus the entropy of fusion of the solid state, and not the other way around? Shouldn't it be final - initial state?

Simmi Diwanji 2B
Posts: 32
Joined: Fri Sep 28, 2018 12:20 am

Re: Entropy of Fusion

The entropy of a liquid is always going to be more than a solid because there is more random movement of particles, so to find the entropy of fusion (going from solid to liquid), you would need to subtract the entropy of solid from the entropy of liquid.

Danny Elias Dis 1E
Posts: 60
Joined: Fri Sep 28, 2018 12:19 am

Re: Entropy of Fusion

Just to be sure, S on its own must always be positive, but deltaS can be positive or negative, right?

Alexa Tabakian 1A
Posts: 38
Joined: Fri Sep 28, 2018 12:20 am

Re: Entropy of Fusion

Yes, delta S can be both positive and negative.