explain why the bond angles found for the molecules below is as given below.

Question

Methane 109.5

Ammonia 107.5

water 104.5

Answer 1

Methane is a tetrahedral shape and those angles are 109.5 degrees.
NH3 is tetrahedral electronic geometry with a lone pair of electrons. The lone pair repels the three H atoms so the angle is a little less than the 109.5.
H2O has two lone pairs so the repulsion is more so. The angle is even less than that of NH3.

Answer 2

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