Which law states that all pure gases have the same z factor at the same reduced pressure and reduced temperature?

Which law states that all pure gases have the same z factor at the same reduced pressure and reduced temperature?

• A. Avogadro's Law
• B. Boyle's Law
• C. Law of Corresponding States
• D. Charles' Law

Answer: (C)

The Law of Corresponding States says that when you express gas properties in reduced form using each gas’s critical constants, all simple gases show the same behavior, so the compressibility factor Z depends only on the reduced pressure and reduced temperature. Since Z = PV/RT and Pr = P/Pc, Tr = T/Tc, the same reduced conditions bring about the same Z for any pure gas. This is why, at the same reduced pressure and temperature, different gases align on the same behavior curve. The other laws describe relationships that don’t involve scaling by critical properties or the generalized behavior of real gases, so they don’t predict this universal Z at corresponding states.

The Law of Corresponding States says that when you express gas properties in reduced form using each gas’s critical constants, all simple gases show the same behavior, so the compressibility factor Z depends only on the reduced pressure and reduced temperature. Since Z = PV/RT and Pr = P/Pc, Tr = T/Tc, the same reduced conditions bring about the same Z for any pure gas. This is why, at the same reduced pressure and temperature, different gases align on the same behavior curve. The other laws describe relationships that don’t involve scaling by critical properties or the generalized behavior of real gases, so they don’t predict this universal Z at corresponding states.