18-31. In formaldehyde, the transition n S p*(T1) occurs at 397 nm, and the n S p*(S1) transition comes at 355 nm. What is the differ- ence in energy (kJ/mol) between the S1 and T1 states? This differ- ence is due to the different electron spins in the two states.

The difference in energy between the and states is 35.7 kJ/mol.

Explanation:

The Planck's equation :

Where:

E = Energy of the electromagnetic radiations.

h = Planck's constant =

c = speed of light =

= Wavelength of the electromagnetic radiations.

Energy associated with transition :

Wavelength associated  with transition :

Energy associated with transition :

Wavelength associated  with transition :

The difference in energy between the and states:

1 J = 0.001 kJ

1 mole =

The difference in energy(kJ/mol) between the and states:

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