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One mole of a van der Waals' gas obeying...

One mole of a van der Waals' gas obeying the equation
`(P + a/(V^2)) (V - b) = RT`
undergoes the quasi-static cyclic process which is shown in the P-V diagram. The net heat absorbed by the gas in this process is

A

`1/2 (P_1 - P_2)(V_1 - V_2)`

B

`1/2 (P_1 + P_2)(V_1 - V_2)`

C

`1/2 (P_1 + a/(V_1^2) - P_2 - a/(V_2^2))(V_1 - V_2)`

D

`1/2 (P_1 + a/(V_1^2) + P_2 - a/(V_2^2))(V_1 - V_2)`

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