A 9.00 mL ampule of a 0.100 M solution of naphthalene in hexane is excited with a flash of light. The naphthalene emits 15.7 J of energy at an average wavelength of 349 nm.What percentage of the naphthalene molecules emitted a photon?

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this is for 8.00mL and 11.1J

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first use the formula E = hc/λ 6.626*10^-34 x (times) 2.998*10^8/ 349*10^-9 nm = 5.692*10^-19J # of the photons emitted 11.1 /5.692*10^-19 = 1.95*10^19 Photons moles of nepthalene 8/1000 x 0.110 =8.8*10^-4 mol # of its molecules 8.8*10^-4x 6.022*10^23(avogadro #) =5.30*10^20 molecules 1.95*10^19/5.30*10^20 x100 =3.7% answer

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