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### reversible reactions

Posted: 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 :)

### Re: reversible reactions

Posted: 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.

### Re: reversible reactions

Posted: 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.

### Re: reversible reactions

Posted: 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.

### Re: reversible reactions

Posted: Sun Feb 09, 2020 11:02 pm
It will be said if it is reversible.