For which gases does the ratio of PV to RT equal a constant?

Answer 1

presumably every gas.

By definition, #(PV)/(RT) = Z# is the compressibility factor. When #Z > 1#, the gas's repulsive forces dominate (it takes up more molar volume than its ideal counterpart), and when #Z < 1#, the gas's attractive forces dominate (it takes up less volume than its ideal counterpart).

As far as I know, this extent remains constant for any given set of conditions (pressure, volume, quantity of gas, temperature, etc.) under which we observe a given gas. For any given gas, it is compressible to a given extent determined by its identity.

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Answer 2

Ellie Andrews

For an ideal gas, the ratio of PV to RT equals a constant.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.