Chemistry, 14.12.2019 12:31 mackenzie27717

Use vsepr theory to predict bond angles in the following covalently bonded molecules. explain your predictions.
a. methane
b. ammonia
c. water

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Answer from: natlovesfood

Bond angle for methane is 109.5°,Bond angle for ammonia is 107° and Bond angle for water is 104.5°

: $Formula used :{\text{Number of electrons}} =\frac{1}{2}[V+N-C+A]$

where, V = number of valence electrons present in central atom

N = number of monovalent atoms bonded to central atom

C = charge of cation

A = charge of anion

a. Methane: CH_4

In the given molecule, carbon is the central atom and there are 4 Hydrogens as monovalent atoms.

$Formula used :{\text{Number of electrons}} =\frac{1}{2}[4+4-0+0]=4$

The number of electrons is 4 that means the hybridization will be sp^3 and geometry of the molecule will be tetrahedral.The bond angle for terahedral geometry is 109.5°.

b. Ammonia: NH_3

In the given molecule, nitrogen is the central atom and there are 3 Hydrogens as monovalent atoms.

$Formula used :{\text{Number of electrons}} =\frac{1}{2}[5+3-0+0]=4$

The number of electrons is 4 that means the hybridization will be sp^3 and geometry of the molecule will be pyramidal as there are three bond pairs and one lone pair.The bond angle for pyramidal geometry is 107°.the bond angle reduces due to lone pair bond pair repulsions.

c. water : H_2O

In the given molecule, oxygen is the central atom and there are 2 Hydrogens as monovalent atoms.

$Formula used :{\text{Number of electrons}} =\frac{1}{2}[6+2-0+0]=4$

The number of electrons is 4 that means the hybridization will be sp^3 and geometry of the molecule will be bent as there are two bond pairs and two lone pairs.The bond angle for pyramidal geometry is 104.5°.The bond angle reduces further due to greater lone pair-lone pair repulsions.

Use vsepr theory to predict bond angles in the following covalently bonded molecules. explain your p

Answer from: Quest

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –

6.022

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,

will have a gram-molecular weight of 352g.

Answer from: Quest

indium, and thallium have three electrons i think

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