Problem: Which of the following substances has only London dispersion forces as the intermolecular force?a) CH3OHb) NH3c) H2Sd) Kre) HCl

FREE Expert Solution
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FREE Expert Solution

We’re being asked to identify the molecule with London dispersion forces as its only IMF among the given compounds


Recall that there are several types of intermolecular forces:

1. Ion-dipole interaction – occurs between an ion and a polar covalent compound

2. Hydrogen bonding – occurs in compounds where hydrogen is directly connected to an electronegative element such as N, O, or F

3. Dipole-dipole interaction – occurs between two polar covalent compounds

4. Induced-dipole interaction – occurs when a nonpolar compound interacts with a polar compound

5. Dispersion forces – occurs in all compounds. This is the primary intermolecular force exhibited by nonpolar compounds.


In this case, we need to do the following steps to determine their IMF

Step 1: Determine the central atom in the molecule.

Step 2: Calculate the total number of valence electrons present.

Step 3: Draw the Lewis structure for the molecule.

Step 4: Determine the polarity and IMF of the molecule.

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Problem Details

Which of the following substances has only London dispersion forces as the intermolecular force?

a) CH3OH

b) NH3

c) H2S

d) Kr

e) HCl

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Intermolecular Forces concept. You can view video lessons to learn Intermolecular Forces Or if you need more Intermolecular Forces practice, you can also practice Intermolecular Forces practice problems .

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Based on our data, we think this problem is relevant for Professor McCarty's class at HARVARD.