Why is that molecules of a liquid near the free surface possess extra energy?

Why is there rich amount of carbon dioxide near the surface of earth ?

What is the value of 'g' at a height near the surface of earth?

Do all photoelectrons emitted from a metal surface possess th esame energy?

For a surface molecule

Why does a configuration of charges possess potential energy?

Surface tension is exhibited by liquids due to force of attraction between molecules of the liquid. The surface tension decreases with increase in temperature and vanishes at boiling point. Given that the latent heat of vaporation for water rho_(w) = 540kcal/kg ,mechanical equivalent heat =4.2j/cal Avogadro's No. N_A = 6.0 xx 10^26 , and the molecular weight of water M_A = 18 kg for 1 k mole. Estimate the energy required for oe molecule of water to evaporate.

What is the effect of solute on the surface tension of liquid?

Why there is practically no atmosphere near the surface of the moon?

Why is the DNA molecule compared to a spiralling staircase?