Suppose you have a gas that obeys the following modified van der Waals equation: P(V-nb)=nRT   a)  In 1–2 sentences, provide a physical interpretation for this equation. HINT:  Compare this with the actual van der Waals equation. What does the missing term represent? b)  For a gas obeying this modified van der Waals equation, derive an expression for the work done by a reversible and isothermal change in volume. c)  For this modified van der Waals equation (with n and b as constants), find the following two partial derivatives for i and ii

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