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A 9.00 mL ampule of a 0.150 M solution of naphthalene in hexane is excited with...

A 9.00 mL ampule of a 0.150 M solution of naphthalene in hexane is excited with a flash of light. The naphthalene emits 18.4 J of energy at an average wavelength of 349 nm.

What percentage of the naphthalene molecules emitted a photon?
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