entropy and enthalpy

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

entropy and enthalpy

Postby josephyim1L » Tue Feb 19, 2019 12:33 am

are entropy and enthalpy always correlated?

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

Re: entropy and enthalpy

Postby Carine Tamamian 2B » Tue Feb 19, 2019 12:49 am

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

Adam Vuilleumier 2K
Posts: 60
Joined: Fri Sep 28, 2018 12:27 am

Re: entropy and enthalpy

Postby Adam Vuilleumier 2K » Tue Feb 19, 2019 12:02 pm

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

Postby Ryan Troutman 4L » Tue Feb 19, 2019 12:13 pm

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

Postby KimGiang2F » Tue Mar 12, 2019 4:31 am

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

Postby Samantha Chang 2K » Tue Mar 12, 2019 10:22 am

Yes, they are correlated for Gibbs Free energy


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