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A lithium flame has a characteristic red color due to emissions of wavelength 671nm. What is the mass equivalence of 7.0mol of photons of this

A lithium flame has a characteristic red color due to emissions of wavelength 671nm. What is the mass equivalence of 7.0mol of photons of this wavelength (1J=1kgm2/s2) ? X.0 (Enter your answer in scientific notation.)

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