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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?

Sep 23rd, 2015

Thank you for the opportunity to help you with your question!

this is for 8.00mL and 11.1J

use for this calculation for your question

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 

Please let me know if you need any clarification. I'm always happy to answer your questions.
Sep 29th, 2015

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