Answer
$ 1312 kJ/ mol-photon $
Work Step by Step
We find:
$\frac{2.179 \times 10^{-18}J}{1 photon} \times \frac{6.022 \times 10^{23} photon}{1 mol -photons} \times \frac{1 kJ}{1000 J} = 1312 kJ/ mol-photon $
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