HcR∞ = 2.18*10^-18 J/atom..since the value of the Rydberg constant is a physical constant relative to "atomic" spectra so let us suppose this value for the atom... If this is multiplied by NA 2.18*10^-18 x 6.02214179(30)×10^23 =1 312 826.91this can be for mol^-1 ... If this does not work, do it vice versa i.e rather than multiplying by the NA, divide by it... Let me know the correct answer, if you get to know??