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Give a detailed accounte on compressbility factor. |
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Answer» Solution :The deviation of real GASES from ideal behaviour is meausred in terms of a ratio of PV to nRT. This is termed as compression factor. MATHEMATICALLY, `Z=(PV)/(nRT)` For ideal gases `Z=1` at all temperatures and pressure, because `PV=nRT` (II) When a gas deviates from ideal behaviour, its Z value deviates from unity. (iii) At high pressure thesegases have `Z gt 1` and are difficult to compress. At intermediate pressures, `Z lt 1`. (iv) Above the Boyal POINT `Z gt 1` for real gases, ie., the real gases show positive deviation. (v) Below the Boyle point, the raal gases first show a decreases for, Zreaches a minimum and then increases with the increases in pressure. (vi) Hence, the compressbility factor Zcan be rwritten as `Z=(PV_("real"))/(nRT)""(a)` `V_("ideal")=(nRT)/(P)""(b)` Substituting (b) in (a) `Z=(V_("real"))/(V_("ideal'')` (vi) Where `V_("real")` is the molar volumne of the real gas and `v_("ideal")`is the molar volume of it when it behaves ideal. |
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