Question

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

Answer 1

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

A chef is using honey in a recipe. The honey is too thick to pour out of the jar. How could the chef make the honey easier to pour? heat it

Water’s molar mass is 18.01 g/mol. The molar mass of methanol is 32.01 g/mol. At room temperature, water is 64% more viscous than methanol. Which substance has the stronger intermolecular attraction? water

Answer 2

B. Motor oil

Step-by-step 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.