Work, reversible and irreversible


Moderators: Chem_Mod, Chem_Admin

Ethan-Van To Dis2L
Posts: 50
Joined: Fri Sep 29, 2017 7:05 am

Work, reversible and irreversible

Postby Ethan-Van To Dis2L » Mon Jan 22, 2018 11:07 pm

So I was looking at Example 8.5 and it said that we should expect the work from a irreversible reaction to be less than that of a reversible reaction. Can someone explain to me why that is?

kaushalrao2H
Posts: 63
Joined: Thu Jul 13, 2017 3:00 am
Been upvoted: 2 times

Re: Work, reversible and irreversible

Postby kaushalrao2H » Mon Jan 22, 2018 11:56 pm

in reversible expansion, the maximum amount of work is being done by the system because external pressure remains equal to the internal pressure as the gas expands. in irreversible expansion, the external pressure is constant and work is not maximized.

Janine Chan 2K
Posts: 71
Joined: Fri Sep 29, 2017 7:04 am

Re: Work, reversible and irreversible

Postby Janine Chan 2K » Tue Jan 23, 2018 12:11 pm

Also, in reversible expansion, the external pressure always matches the internal pressure. If there is any increase in pressure, external and internal energy will match each other. So, reversible reactions are always doing the maximum possible amount of work. In a reversible reaction, the process is completed very quickly, and external and internal pressure do not match each other at all times. This implies that the maximum amount of work possible is not being done.


Return to “Concepts & Calculations Using First Law of Thermodynamics”

Who is online

Users browsing this forum: No registered users and 1 guest