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**solving for "b" with van der Waals**

1. Homework Statement

The problem gives me "a", the temperature, volume, number of moles, and pressure. It asks me to solve for "b".

I have set up the equation to solve for b, and done it. The answer comes out with the right units but it is negative.

2. Homework Equations

Can the value of the coefficient be negative or does that mean I did it wrong?

3. The Attempt at a Solution

The equation:

p = nRT/(V-nb) - a(n/V)^2

Using that equation, I came up with:

b = (Vp + Va(n/V)^2 - nRT) / (np + na(n/V)^2)

I came up with b = -4.58x(10^-4) (m^3) (mol^-1)

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