One mole of a gas obeying the equation of state P(V-b) = RT is made to expand from a state with coordinates (P 1,V 1) to a state with (P 2,V 2) along a process that is depicted by a straight line on a P–V diagram. Then, the work done is given by

1. A. 1 2 ,(P 2-P 1)(V 2+V 1+2b)
2. B. 1 2 ,(P 1+P 2)(V 2-V 1)
3. C. 1 2 ,(P 2-P 1)(V 2-V 1)
4. D. 1 2 ,(P 1+P 2)(V 2-V 1+2b)

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