source : yahoo.com
A mole of red photons of wavelength 725 nm has ____ kJ of energy?
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:
/ 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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