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Homework Help: On Molecular Geometry of Hydrazine and Electronegativity

  1. Jun 19, 2012 #1
    1. The problem statement, all variables and given/known data

    1. What is the molecular shape of Hydrazine N2H4 w.r.t. N atom?

    2. H2S and H2O, which one has a larger bond angle?

    2. The attempt at a solution

    1. Trigonal Pyramidal is the answer given. But Hydrazine has 5 atoms around its central atom and I'm unable to fathom why is it in trigonal pyramidal.

    2. H2O is the answer as O is more electronegative. But why is this the case? I've checked the internet and nothing tells me why an electronegative central atom could cause a larger bond angle.

    Thank you for your time.
  2. jcsd
  3. Jun 19, 2012 #2


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    Staff: Mentor

    Hint: hydrazine doesn't have a central atom.

    Are you sure oxygen electronegativity plays a role here? Explanations I remember called mostly for steric effects.
  4. Jun 19, 2012 #3
    Ah~ there are 3 H atoms and one pair of lone electrons around N.

    Steric forces? The explanation given to me was electronegativity?
  5. Jun 19, 2012 #4


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    Staff: Mentor

    Sounds like ammonia, not hydrazine.

    Can't help it.
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