Isothermal

isochoric/isometric:
isothermal:
isobaric:

Moderators: Chem_Mod, Chem_Admin

Hellen Truong 2J
Posts: 50
Joined: Sat Jul 22, 2017 3:00 am
Been upvoted: 1 time

Isothermal

Postby Hellen Truong 2J » Thu Feb 15, 2018 3:51 pm

Why does an isothermal reaction have no change in internal energy?

Johann Park 2B
Posts: 51
Joined: Thu Jul 27, 2017 3:01 am
Been upvoted: 1 time

Re: Isothermal

Postby Johann Park 2B » Thu Feb 15, 2018 4:49 pm

Internal energy is a state function dependent on temperature, thus, when temperature does not change (definition of isothermal), there is no change in internal energy. Additional note: Dealing with ideal gases, contributions to U are kinetic energy and intermolecular interactions. The latter is 0, because we are dealing with ideal gases, and so we are left with kinetic energy. The kinetic energy does not change if the temperature does not change.

Amanda Wu 2C
Posts: 31
Joined: Sat Jul 22, 2017 3:00 am

Re: Isothermal

Postby Amanda Wu 2C » Thu Feb 15, 2018 8:27 pm

In the case of an ideal gas, the change in internal energy is given by delta U = (3/2)*R*delta T. If a reaction involving an ideal gas is isothermal, the temperature remains constant, meaning delta T=0. Hence, plugging delta T=0 in the aforementioned delta U equation gives delta U=0.


Return to “Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)”

Who is online

Users browsing this forum: No registered users and 1 guest