# electromagnetic radiation question

Discussion in 'Chemistry' started by bardobeing, Nov 21, 2007.

1. ### bardobeingRegistered Member

Messages:
2
determine the energy of 1.70 mol of photon for infrared radiation(1420 nm) in kj.

i tried doing this question using the relation E = hc/wavelength but the photon they give is in mols and im not quiet sure on how to determine the energy of 1.70 mols of poton.

any help is appreciated, ty

to hide all adverts.
3. ### James RJust this guy, you know?Staff Member

Messages:
30,862
1 mol of anything is $6.02 \times 10^{23}$ of the things. You have the energy of a single photon, so all you need to do is calculate the energy of 1.70 mol of them.