Question

Steam at 100°C can be thought of as an excited state of water at 100°C. Suppose that a laser could be built based upon the transition from steam to water, with the energy lost per molecule of steam appearing as a photon. What would the frequency of such a photon be? To what region of the spectrum does this correspond? The heat of vaporization of water is 2260 kJ_kg and its molar mass is 18.02 kg_kmol.

Answer 1

Answer:

The energy of vaporization of water per mol is 2260kJ/kg × 18.02kg/kmol = 4.07 ×

104J/mol.

So, each molecule emit the energy E = 6.76 × 10−20J

And the frequency of the

emission light is ν = 1.02 × 1014Hz which corresponds to the infrared light .

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