## reversible reactions

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Joined: Sat Sep 14, 2019 12:17 am

### reversible reactions

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

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
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Joined: Thu Jul 11, 2019 12:15 am

### Re: reversible reactions

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

Jielena_Bragasin2G
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### Re: reversible reactions

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

It will be said if it is reversible.