A mole of oxygen, considered as a van der Waals gas, undergoes a reversible isothermal expansion at fixed temperature T₀ from an initial volume V_i to a final volume V_f. Determine the work Wi_f performed on the van der Waals gas in terms of the parameters a, and b. 

Numerical Application:

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-3 To = 273 K, V₁ = 22.3 . 10-³ m³, Vf3Vi, po = 1.013 105 Pa, a = 0.14 Pa mº and b 3.2 10-6 m³. = .