The behaviour of a real gas is usually depicted by plotting compressibility factor Z versus P at a constant tempera-ture. At high temperature and high pressure, Z is usually more than 1. This fact can

Question

The behaviour of a real gas is usually depicted by plotting compressibility factor Z versus P at a constant tempera-ture. At high temperature and high pressure, Z is usually more than 1. This fact can be explained by van der Waal's equa-tion when

Prashant Kotian · Accepted Answer

Correct answer: A. At very high pressure, the volume term V is small, so b is not negligible. However, P is extremely large compared to a/V^2, making 'a' negligible. The equation becomes P(V-b) = RT => PV - Pb = RT => Z = 1 + Pb/RT, explaining why Z > 1 .

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