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Expected angle is 109.5 degrees.....

There are 2 O-H bond pairs, and 2 lone pairs of electrons on the O atom.

It is known for a fact that LP-LP repulsions are greater than BP-BP repulsions. this strains the H2O molecule, affecting the H-O-H bond angle, reducing it to 104.45 degrees.

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16y ago
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10y ago

because of the lone pair of electrons pushes the hydrogens apart.

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13y ago

The bulkier non-bonding pairs compress the angle from the nominal 109.5 degrees.

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Q: Why is the H-O-H bond angle in water around 104 degrees?
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