Question

2.
A liquid is in equilibrium with its vapour at its boiling point. On the average, the
molecules in the two phases have equal
(a) inter-molecular forces
(b) potential energy
(c) total energy
(d) kinetic energ:

Answer 1

Answer:

Option (d) Kinetic Energy

Explanation:

When a liquid is in equilibrium with its vapout at its boiling point, the molecules in the two phases have equal kinetic energy.

At equilibrium, the rate of molecules going from the liquid to the gaseous phase equal to the rate of molecules going from the gaseous phase to the liquid surface and hence they have equal kinetic energy.