Tejas posted an Question
September 14, 2020 • 01:57 am 30 points
  • IIT JAM
  • Chemistry (CY)

How compare vander waals constant (a and b) of different molecule?

how compare Vander waals constant (a and b) of different molecule?

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  • Tejas

    on which factor a and b depends...and please give example..

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    read my explanation tejas

  • Tejas

    can u give brief explanation pls?

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    yes wait

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    https://youtu.be/lXSASKYfW_U check this video significance of a and b

  • Suman Kumar best-answer

    A is attractive forces depends on dipole moment & polarity

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    b is repulsive force depends on van der wall size of the molecule

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    Priyanshu kumar Best Answer

    Mainly molecular size decides vanderwaal constant upto great extent

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    But here a is for intermolecular force of attraction

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    and b for effective molecular size

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    So which gas is given to you...check intermolecular forces of attraction...like strength of forces...more strength more a value

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    and secondly more molecular size more b value

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    this got na tejas?

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    can u give example?

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    yes why not

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    compare with NH3,CO2,O2 methane

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    ammonia have intermolecular forces of attraction whose strength is more...so it is most easily liqueified

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    so it has largest a value

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    For b value directly check molecular size...more size more b value

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    example ...ethane C2h6 has more b value than helium

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    hope you got this

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    yes sir I got 🙏

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    😊👍

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