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plz help! due tonight How much energy (in kJ ) do 3.0 moles of photons, all with a wavelength of 680.nm, contain? 400. kJ 528kJ

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How much energy (in kJ ) do 3.0 moles of photons, all with a wavelength of 680.nm, contain? 400. kJ 528kJ 366kJ 234kJ 160. kJ A laser pulse with a wavelength of 539nm contains 1.84mJ of energy. How many photons are in the laser puise? Express the number of photons to three significant figures

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