What is the chemical formula of Vasoline?

Answer 1

Vaseline is a mixture of long chain nonpolar hydrocarbons. They have an average length of about 20 to 25 carbon atoms. The extra surface area between these carbon chains compared to short chains causes greater dispersion forces between them and gives them a higher boiling point. This is why they remain semi-solid at room temperature.

Answer 2

It is mostly a petrolium fraction.