In which situation does delta U=0 and that q=-w


and

Moderators: Chem_Mod, Chem_Admin

Peter Dis1G
Posts: 97
Joined: Fri Sep 29, 2017 7:04 am

In which situation does delta U=0 and that q=-w

Postby Peter Dis1G » Sun Jan 28, 2018 8:05 pm

Can anyone explain this? Thanks in advance!

CameronJohari1J
Posts: 66
Joined: Fri Sep 29, 2017 7:06 am
Been upvoted: 1 time

Re: In which situation does delta U=0 and that q=-w

Postby CameronJohari1J » Sun Jan 28, 2018 8:16 pm

The situation occurs when the system experiences isothermal change, thus delta U is zero. Subsequently, q=-w means that heat loss is equal work done on the system and visa versa is also true.

Peri Bingham 1G
Posts: 50
Joined: Fri Sep 29, 2017 7:03 am

Re: In which situation does delta U=0 and that q=-w

Postby Peri Bingham 1G » Sun Jan 28, 2018 8:17 pm

The situation would be an isothermal (constant temperature) reversible expansion.

Anna Li 2E
Posts: 21
Joined: Sat Jul 22, 2017 3:00 am

Re: In which situation does delta U=0 and that q=-w

Postby Anna Li 2E » Sun Jan 28, 2018 9:21 pm

U stands for internal energy, so when delta U (the change in internal energy) is zero, that indicates that reaction is isothermal, a.k.a there is no change in temperature. This occurs when q, (also known as heat added to the system) is equal to -w. You can view this -w as the system expanding of its own volition, not due to any outside influence.

Peter Dis1G
Posts: 97
Joined: Fri Sep 29, 2017 7:04 am

Re: In which situation does delta U=0 and that q=-w

Postby Peter Dis1G » Sun Jan 28, 2018 9:57 pm

By the way,is the reversible work equation also used for isothermal situation only?


Return to “Calculating Work of Expansion”

Who is online

Users browsing this forum: No registered users and 1 guest