The latent heat of vaporization for water at room temperature is 2430 J/g. (a) H

Question

The latent heat of vaporization for water at room temperature is 2430 J/g.

(a) How much kinetic energy does each water molecule that evaporates possess before it evaporates?
J/molecule
(b) Find the pre-evaporation rms speed of a water molecule that is evaporating.
km/s
(c) What is the effective temperature of these molecules (modeled as if they were already in a thin gas)?
KWhy do these molecules not burn you?

These molecules got to be slow-moving in collisions that made other molecules fast-moving; the average molecular energy decreases. These molecules got to be slow-moving in collisions that made other molecules fast-moving; the average molecular energy is unaffected.     These molucules got to be fast-moving in collisions that made other molecules slow-moving; the average molecular energy is unaffected. These molecules got to be fast-moving in collisions that made other molecules slow-moving; the average molecular energy increases.

Explanation / Answer

2430 J/g * 18g/mol = 43740 J/mol
then
43740 J/mol / 6.022 X 10^23 = 7.26 X 10^-20 J / molecule

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