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An ampule of napthalene in hexane contains 4.00×10−4mol napthalene. The napthalene is excited with a flash...

An ampule of napthalene in hexane contains 4.00×10−4mol napthalene. The napthalene is excited with a flash of light and then emits 16.3 J of energy at an average wavelength of 349 nm. What percentage of the naphthalene molecules emitted a photon?

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