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Given van der Waals constant for NH3 , H2 , O2 and CO2 are respectively 4·17, 0·244, 1·36 and 3·59, which one of the following gases is most easily liquefied ?
Asked by suryateja14961 | 17 Apr, 2020, 01:52: PM
answered-by-expert Expert Answer
The ease of liquification of a gas depends on their intermolecular force of attraction
which in turn is measured in terms of van der Waals' constant 'a'.

Hence, higher the value of 'a' , greater the intermolecular force of attraction, easier the liquification.
 
For the given gases,  Van der Waal's constant 'a' = 4.17 of NH3 is highest .
 
Hence NH3 is liquified easily  compare to H2 and O2
 
Next higher Van der Waal's constant 'a' = 3.59 is of CO2 ,
 
Hence CO2 is also liquifiable easily compare to H2 and O2
Answered by Thiyagarajan K | 17 Apr, 2020, 02:57: PM

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