reversible reactions

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Ghadir Seder 1G
Posts: 134
Joined: Sat Sep 14, 2019 12:17 am

reversible reactions

Postby Ghadir Seder 1G » Sun Feb 09, 2020 10:49 pm

How do I know which equation to use for work without the question stating whether the reaction is reversible or irreversible? Alluding to problem 4B.5 :)

Niharika 1H
Posts: 50
Joined: Thu Jul 25, 2019 12:16 am

Re: reversible reactions

Postby Niharika 1H » Sun Feb 09, 2020 10:51 pm

I believe the question states it if its reversible, which is the only scenario where we'd use the reversible reaction equation for W.

Zoya Mulji 1K
Posts: 105
Joined: Thu Jul 11, 2019 12:15 am

Re: reversible reactions

Postby Zoya Mulji 1K » Sun Feb 09, 2020 10:53 pm

i'm pretty sure it should always tell us reversible or irreversible to indicate which equation to use.

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Joined: Sat Aug 24, 2019 12:18 am
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Re: reversible reactions

Postby Jielena_Bragasin2G » Sun Feb 09, 2020 10:57 pm

Isobaric (no change in pressure) means it is an irreversible reaction. Work is found through W=P*deltaV or W=n*R*deltaT and q can be found from q=n*Cp*deltaT.

Isothermal (no change in temperature) is reversible. DeltaU (internal energy) is equal to zero so w=-q or -w=q. Work is found from W=n*R*T*ln(V2/V1) or W=n*R*T*ln(P1/P2)

There are more equations to know for each one but these allow me to distinguish the two.

Timmy Nguyen Dis 1I
Posts: 107
Joined: Sat Aug 17, 2019 12:17 am

Re: reversible reactions

Postby Timmy Nguyen Dis 1I » Sun Feb 09, 2020 11:02 pm

It will be said if it is reversible.

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