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On Molecular Geometry of Hydrazine and Electronegativity

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Kyoma
#1
Jun19-12, 02:59 AM
P: 99
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.
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Borek
#2
Jun19-12, 03:22 AM
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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.
Kyoma
#3
Jun19-12, 04:51 AM
P: 99
Ah~ there are 3 H atoms and one pair of lone electrons around N.

Steric forces? The explanation given to me was electronegativity?

Borek
#4
Jun19-12, 05:29 AM
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On Molecular Geometry of Hydrazine and Electronegativity

Quote Quote by Kyoma View Post
Ah~ there are 3 H atoms and one pair of lone electrons around N.
Sounds like ammonia, not hydrazine.

Steric forces? The explanation given to me was electronegativity?
Can't help it.


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