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Question:

At a moderate pressure, the van der Waal's equation is written as: [P + a/V²]V = RT. The compressibility factor is equal to:

(1−RT/Va)

(1+a/RTV)

(1+RT/Va)

(1−a/RTV)

Solution:

The above equation can be written in the form PV/RT + a/RTV = 1, where Z = PV/RT. Z = 1 − a/RTV