HOw do i solve this question?

Question

A microwave oven operates with radiation having a wavelength of 20.0 cm. Calculate the energy of this radiation in joules per photon.
________J/photon
Calculate the energy of this radiation in kilojoules per mole of photons.
______ kJ/mol

Answer 1

Go here:

http://firstyear.chem.usyd.edu.au/Questions/AtomicStructure.htm

and look at question 8 with answer included. This should give you a good idea on how to solve your question.

Answer 2

E = h × nu
= h × (lambda)

where e is energy, h is planck's constant, nu is freqency and lambda is wavelength.

e = (6.626068 × 10^-34) * (20 × 10^-2)
= 1.3252136 × 10^-34 J/photon

= (1.3252136 × 10^-34) x (6.022 x 10^23 mol^-1)
= 7.9804363 × 10^-9 kJ/mol