Question
Asked Nov 26, 2019
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2. Determine which of the following molecules are polar and which would be nonpolar.
work. (Hint: Show the dipole moments of the individual bonds)
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your
(a) CS2
(b) H2O
(c) PH3
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2. Determine which of the following molecules are polar and which would be nonpolar. work. (Hint: Show the dipole moments of the individual bonds) Show your (a) CS2 (b) H2O (c) PH3

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Expert Answer

Step 1

Phosphine (PH3) is a polar molecule with non-polar bonds. The phosphorus is bonded to three hydrogen atoms and has a lone pair of electrons. Since hydrogen and phosphorus are equal in electronegativity, meaning that they attract the shared pairs of electrons the same amount, the bonding electrons are shared equally making the covalent bonds non-polar. 

The dipole moment of PH3 is 0.58 D.

The lone pair of electrons on phosphorus causes the molecule to be asymmetrical with respect to charge distribution and that's why the molecule is polar even though it has non-polar bonds. Its shape is trigonal pyramidal.

Step 2

CS2 is a linear molecule and the Sulfur (S) atoms on each end are symmetrical. Polarity results from an unequal sharing of valence electrons. Because of this symmetry there is no region of unequal sharing and CS2 is a nonpolar molecule.

The dipole moment of CS2 is zero

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S=C-S

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Step 3

Water is a polar molecule because both oxygen and hydrogen atoms have different electronegativities (the electronegativity value of hydrogen is 2.1, while the electronegativity of oxygen is 3.5); therefore, both bonds are polar. Since oxygen is more electronegative than hydroge...

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Н Н

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Chemical bonding

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