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Write the compressibility factor interms...

Write the compressibility factor interms of molar volumes. What is its significance?

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Compressibility factor is the ratio of actual molar volume of a gas to the molar volume of a gas.
`z = ("real volume of gas")/("ideal volume of gas").`
The value of .z. denotes the extent of deviation of the gas from the behaviour of ideal gas behaviour at the given pressure and temperature.
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