## entropy and enthalpy

Volume: $\Delta S = nR\ln \frac{V_{2}}{V_{1}}$
Temperature: $\Delta S = nC\ln \frac{T_{2}}{T_{1}}$

josephyim1L
Posts: 61
Joined: Fri Sep 28, 2018 12:15 am

### entropy and enthalpy

are entropy and enthalpy always correlated?

Carine Tamamian 2B
Posts: 61
Joined: Fri Sep 28, 2018 12:23 am

### Re: entropy and enthalpy

Yes they are, and it's depending on whether the reaction is exothermic or endothermic.

Posts: 60
Joined: Fri Sep 28, 2018 12:27 am

### Re: entropy and enthalpy

Since G = H - TS, entropy and enthalpy are correlated since they must subtract to equal Gibbs' free energy.

Ryan Troutman 4L
Posts: 68
Joined: Fri Sep 28, 2018 12:22 am

### Re: entropy and enthalpy

Gibbs free energy equation relates entropy and enthalpy in deltaG = deltaH - T*deltaS. It allows us to determine whether the reaction is endothermic or exothermic

KimGiang2F
Posts: 31
Joined: Fri Sep 28, 2018 12:19 am

### Re: entropy and enthalpy

There is no direct relationship between entropy and enthalpy. Enthalpy (H) is the amount of energy released or absorbed during a chemical reaction while entropy (S), defines the degree of randomness or disorder in a system. However, the free energy (G) regroups both terms as G= H-TS, where at a constant temperature, the change on free energy is defined as ∆G= ∆H-∆TS. Therefore, the free energy expression provides a relationship between enthalpy and entropy. Thus, for a system at equilibrium, ∆G=0 and then we find that ∆S=∆H/T.

Samantha Chang 2K
Posts: 69
Joined: Fri Sep 28, 2018 12:17 am

### Re: entropy and enthalpy

Yes, they are correlated for Gibbs Free energy