What is the energy required to excite one na atom (wavelength = 589 nm) ? to excite one mole of na atom?

The energy required to excite one Na atom 3.37 x 10⁻¹⁹ J

E = hc / λ

where h = plancks constant = 6.626 x 10⁻³⁴ J·s

and λ = 589 nm = 589 x 10⁻⁹m

and c = 3 x 10⁸ m/s

E = (6.626 x 10⁻³⁴ x 3 x 10⁸) / 589 x 10⁻⁹m

E = 3.37 x 10⁻¹⁹J

Energy to excite one mole of na atom = (6.022 x 10 ²³) x 3.37 x 10⁻¹⁹ = 203kj