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(a) What is meant by compressibility fac...

(a) What is meant by compressibility factor of a gas ? Is it always equal to or greater than 1 for all gases?
(b) 1 mole of `SO_(2)` occupies a volume of 320 mL at `27^(@)C` and `4xx10^(6)Pa` pressure. Calculate the compressibility factor of the gas. `(2+3)`

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