source : yahoo.com

## A mole of red photons of wavelength 725 nm has ____ kJ of energy?

Hey, sailor!

Yes, you must convert. Always put the units in, and cancel them out as you calculate. It keeps you from making silly errors.

If v is frequency, then h is Planck’s constant. Just multiply.

This is how it looks when I do it:

3e8 m/s

/ 725 nm

x (1 nm) / (1e-9 m) [because 1 nm = 1e-9 m, so this is just 1]

x 6.6e-34 J-s / photon [<– this is what’s confusing you]

x (6e23 photon) / (1 mol photon)

= ??? J / mol photon

When I say “put in the units”, I mean *very* specific units, if you have to, in order to keep the game honest. “mol H2O” and “mol O2” are not the same ships, sailor, nor is 1 “photon” the same as 1 “mol photon”.

As you were. Aye aye!

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