Chem question?

Avogadro constant, N = 6.023 × 10²³ /mol
Planck constant, h = 6.626 × 10⁻³⁴ J s
Speed of light, c = 3.00 × 10⁸ m/s
Wavelength, λ = 318.5 × 10⁻⁹ m

Energy difference between the two levels responsible for this line
= Nhc/λ
= (6.023 × 10²³ /mol) × (6.626 × 10⁻³⁴ J s) × (3.00 × 10⁸ m/s) / (318.5 × 10⁻⁹ m)
= 376000 J/mol
= 376 kJ/mol