Help with chemistry homework

[Flush535]

I have this chemistry problem that I can't figure out. Anyone have any ideas on how to do it?

How much energy (in joules) is contained in one mole of photons (electromagnetic quanta) of frequency 3.9E+19 Hz?

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[ThinkInvisible]

1. how much mass does one mole of photons have
2. what is the distance in meters between two wave crests at 3.9E+19Hz
3. what is the equation for one joule (since it's a derived unit), considering it probably involves 1 and 2
4. math
5. ???
6. profit