Gasoline and motor oil are chemically similar. They are both mixtures of nonpolar hydrocarbons containing carbon and hydrogen atoms. However, motor oil is much more viscous than gasoline. Which substance probably has the higher average molar mass?

Answers:

A. Gasoline

B. Motor Oil

B. Motor oil

Explanation:

Both gasoline and motor oil are non-polar hydrocarbons. The intermolecular force of attraction in these molecules is the London dispersion force which is higher for molecules with larger molar mass.

Viscosity is essentially the resistance to flow offered by the liquid. This is dependent on the intermolecular force of attraction. Stronger force implies that the molecules are held together strongly and will not move freely resulting in higher viscosity.

It is given that motor oil is more viscous which implies that the molecules in motor oil are held by stronger intermolecular forces of attraction. This would suggest that motor oil would have a higher molar mass than gasoline.

Gasoline and motor oil are chemically similar. They are both mixtures of nonpolar hydrocarbons containing carbon and hydrogen atoms. However, motor oil is much more viscous Motor Oil

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