Question

Water’s molar mass is 18.01 g/mol. The molar mass of glycerol is 92.09 g/mol. At 25°C, glycerol is more viscous than water. Which substance has the stronger intermolecular attraction?
A glycerol because it has a larger molar mass
B glycerol because it is more viscous and has a larger molar mass
C water because it has a lower molar mass
D water because it is less viscous and has a lower molar mass

Answer 1

Answer : Option B) Glycerol because it is more viscous and has a larger molar mass.

Explanation : Viscosity is a quantity which is expressed in terms of the magnitude of internal friction in a fluid, as measured by the force acting per unit area resisting uniform flow. In simple words, due to high intermolecular forces of attraction the viscosity is increased, as there will be more resistance between the molecules for flowing.

Usually high molecular compounds have high viscosity. In this question, glycerol has high molecular weight along with high intermolecular forces of attraction between the molecules as compared to water and therefore, has high viscosity.

Answer 2

Answer:

B)

Explanation:

Chem Unit Test Edgenuity 2020