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# What is the energy in joules of a mole of photons associated with visible light of wavelength 486 nm?

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Jul 12, 2014

$h = 6.626$x${10}^{- 34} J . s$
$c = 3$x${10}^{8}$$m {s}^{-} 1$
 λ=486x${10}^{-} 9$$m$
1 mol photons = $6.023$x${10}^{23}$ photon

Energy of one photon ($E$) = ($6.626$x${10}^{- 34} J . s$ x $3$x${10}^{8}$$m {s}^{-} 1$)/($486$x${10}^{-} 9$$m$)

Energy of one mole photon ($E$) = ($6.023$x${10}^{23}$ x$6.626$x${10}^{- 34} J . s$ x $3$x${10}^{8}$$m {s}^{-} 1$)/($486$x${10}^{-} 9$$m$)

Energy of one mole photon ($E$) =$2.46$x${10}^{5}$$J$

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