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I've got a question that requires me to use the Van der Waals equation in the form:

The process is isobaric, the volume changes from 1m

Ultimately, I need to find initial and final values of T. So I rearranged the formula:

So I need b. I think b is the volume per mole, so that's how I worked it out - as V/n. However, this gave me b as 1m

In short, if someone could point me in the right direction as to what b actually is, I would very much appreciate it. Thank you.

**p(V-b)=nRT**The process is isobaric, the volume changes from 1m

^{3}to 2m^{3}, and there is 1 mole of the unidentified gas.Ultimately, I need to find initial and final values of T. So I rearranged the formula:

**p(V-b)/nR=T**

So I need b. I think b is the volume per mole, so that's how I worked it out - as V/n. However, this gave me b as 1m

^{3}/mol and 2m^{3}/mol. That gives me initial and final temperatures of 0K, which I'm guessing is wrong.In short, if someone could point me in the right direction as to what b actually is, I would very much appreciate it. Thank you.