Explain why ethyl alcohol dissolves readily in water, but gasoline does not. Ethyl alcohol dissolves in water because the OH can form hydrogen bonds with the water. Gasoline cannot form hydrogen bonds with water, and so it does not dissolve in water. A chemical bond is a sharing of electrons. Atoms share electrons so that they have complete octets.
Chemical bonds vibrate.
The molecular mass of a substance is the mass which contains a mole of molecules of that substance. The mole concept provides an easy bridge between the number of molecules and the mass of a substance. Chemical calculations therefore routinely use the mole concept. Natural petroleum is a complex mixture cotainins thousands of compounds. It is refined to yield a single compound or a mixture of compounds having certain desired properties.