Energy of Radiation

E = h•n

= (6.63 x 10-34 J•s)(4.29 x 1014 sec-1)

= 2.85 x 10-19 J per photon

PROBLEM: Calculate the energy of 1.00 mol of photons of red light.

l = 700 nm n = 4.29 x 1014 sec-1

- the range of energies that can break bonds.

E per mol = (2.85 x 10-19 J/ph)(6.02 x 1023 ph/mol)

= 171.6 kJ/mol

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