Question

product the geometry of BF3 ,SF6 ,and NH3 on the basics of VESPR theory​

Answer 1

Answer:

To know the shape of a molecule we first need to calculate its hybridization.

Assuming you know the formula for calculating hybridization of a molecule and difference between geometry and shape.

However if you don't, then don’t worry, the formula for calculating hybridization is : 1/2 ( No. of Valence electrons in central atom - total positive charge on the molecule + total negative charge + no. of monovalent atom)

= 1/2 ( V - C + A + M )

Hope you know the meaning of the term central atom and monovalent atom.

Furthermore, the difference between geometry and shape is that geometry is dependent upon both bond pair and lone pair of electrons whereas shape only depends upon bond pair of electrons.

I am doing the first one giving all the details and rest i will do normally(without so much of details)…

(i) BF3

Hybridization = 1/2 ( no valence electrons on Boron - total positive charge on molecule + total negative charge on molecule + No. of monovalent atom)

V = 3 { Boron electronic configuration: 1s2 2s2 2p1}

C = 0 { total positive charge on molecule}

A = 0 { total negative charge on molecule}

M = No. of F atoms present=3 {F is monovalent atom}

Hybridization = 1/2 ( 3 - 0 + 0 + 3} = 1/2 (6) = 3

Therefore, it is “sp2″ hybridized {1s + 2p = 3 (total)}

Sp2 hybridized means it has trigonal planar geometry.

[Now if you want to know how did I get this, you have to study or do some research on the topic, I cannot explain anything more on this, you simply have to learn which geometry is for which hybridization, that's it. Its not that difficult.]

Now, the main question, what is it's shape, well I have told you earlier that shape depends only on bond pair and not lone pair.. Luckily we don't have any lone pair in this molecule so we don't have to worry much, its shape will be same as that of its geometry.

Hence, its shape will also be trigonal planar.

(ii)NH3

1/2 (5 + 3) = 4

Hybridization = sp3 (1+3=4)

Geometry = Tetrahedral

Shape will be same as gemetry because no lone pair is there, so it is also tetrahedral.

(iii)SF6

1/2 ( 6 + 6) = 6

Hybridization = sp3d2

Geometry = Octahedral

Shape = Octahedral

(iv)PCl5

1/2 ( 5 + 5) = 5

Hybridization = sp3d

Geometry = Trigonal bipyramidal

Shape = Trigonal bipyramidal

HOPE IT HELPS,

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(coz it has taken a lot of effort to write this huge answer)….

Thank you…