5. If 1 erg = 2.390 X 10 kcal, what is the energy in kilocalories of one mole of photons of wavelength 6600 ?

6. If the energy of one photon is given by E = h, then the energy of a mole of photons, a chemically useful piece of information, is given by E = Nh, in which N is Avogadro's number. From the conversion factors given in Problems 3 through 5, calculate Nh in kcal sec. Use this number directly with the frequency of 6600- light to calculate the energy per mole of photons, and verify that the answer is the same as for Problem 5.

7. An even easier way of converting wavelength to energy per mole of photons     is:



Calculate the constant Nhc in units of kcal cm and kcal . (Your answer'should be Nhc = 286,000 kcal .) ,Use this to verify again the energy in kilocalories of a mole of 6600- photons.