You just calculated that the heat of fusion for chloromethane is 6400 J/mol. The heat of fusion for hydrogen is 120 J/mol. Which of the following account for this difference?

a. Hydrogen has stronger intermolecular forces than chloromethane.
b. Hydrogen molecules can pack more closely than chloromethane molecules.
c. Chloromethane can absorb more energy at the same temperature.
d. Chloromethane experiences dipole-dipole interactions.
e. Chloromethane has a higher molar mass than hydrogen.

Explanation:

Heat of fusion is defined as the energy required by a substance in order to change the phase of a solid substance into liquid phase.

It is known that heat of fusion of chloromethane is 6400 J/mol and the heat of fusion of hydrogen is 120 J/mol.

So, more is the intermolecular forces present within a substance more will be the heat required to break its bonds. Therefore, more will be its heat of fusion.

Thus, we can conclude that following statements account for the given difference:

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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