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Math Help - Help me in chemistry

  1. #1
    Newbie
    Joined
    Jan 2008
    Posts
    19

    Exclamation Help me in chemistry

    My question is simple and straight!
    Polarity of HCl is more or that of H2O is greater?
    We know that
    Due to difference in electro negativities a compound is called polar.
    In HCl
    Electronegativity of
    H:2.2
    Cl:3.2
    So in HCl polarity is 3.2-2.2=1
    In water(H2O)
    2H:2.2+2.2=4.4
    O:3.5
    So polarity is 4.4-3.5=0.9
    Whose polarity is greater?HCL or water
    According to this HCl is more polar!
    Am I right or wrong?if I am wrong give a sound reason as I did!
    Thanking peacewanters007!
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  2. #2
    Junior Member
    Joined
    Mar 2008
    Posts
    49
    My apologies, I was thinking only about the indivdual bonds when I replied previously.

    Water is the more polar molecule, here is why:

    The dipole moment of HCl molecule is 1.03 D and that of H2O is 1.84 D.

    Take from here: Tutoring, Chemistry, Chemistry Tutoring, Chemical Bonding and Molecular Structure, Ionic Bond, Covalent Bond, VSEPR Theory, Dipole Moment, Hydrogen Bonding, Electovalent Bonding, Types of Hybridization - Tutorvista.com

    A diatomic molecule has two atoms bonded to each other by a covalent bond. In such a molecule, the dipole moment of the bond gives the dipole moment of the molecule. Thus, a diatomic molecule is polar if the bond formed between the atoms is polar. Greater the electronegativity difference between the atoms, more will be the dipole moment. The dipole moment of HCl molecule is 1.03 D


    In polyatomic molecules the dipole moment not only depends upon the individual dipole moments of the bonds but also on the spatial arrangement of the various bonds in the molecule. In such molecules the dipole moment of the molecule is the vector sum of the dipole moments of various bonds.


    Water molecule has a bent structure with the two OH bonds oriented at an angle of 104.5. The dipole moment of water is 1.84D, which is the resultant of the dipole moments of two O-H bonds.

    Last edited by Ting; April 2nd 2008 at 07:52 AM.
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