Calculate the energy for one mole of photons (an einstein) for light absorbed at 685 nm.?

Avogadro constant, L = 6.022 × 10²³ /mol
Planck constant, h = 6.626 × 10⁻³⁴ J s
Speed of light, c = 3.00 × 10⁸ m/s
Wavelength, λ = 685 nm = 685 × 10⁻⁹ m

Energy for one mole of photons, E
= L h c / λ
= (6.022 × 10²³) × (6.626 × 10⁻³⁴) × (3.00 × 10⁸) / (685 × 10⁻⁹) J
= 175000 J
= 175 kJ

f=c/< and E=H f, E=h c/,