Question

A closed flask contains H${}_2$O in all its three states solid, liquid and vapour at 0${}^o$C. In this the average K.E. of water molecules will be:

• A. greatest in the vapour state
• B. same in all the three states
• C. greatest in the solid state
• D. greater in the liquid than in the vapour state

Answer 1

The correct option is A greatest in the vapour state

In the three states of matter, the maximum kinetic energy is possessed by the gaseous molecules because of its highest average velocity, so water vapour state has the maximum kinetic energy in this situation.