Question

What is the energy (in J) of a mole of photons that have a wavelength of 701 nm? (h = 6.626 × 10⁻³⁴ J • s and c = 3.00 × 10⁸ m/s)

Answer 1

$$E = hc/\lambda$$

$$E = 6.626 × 10⁻³⁴ J • s * 3.00 × 10⁸ m/s / 701×10^{-9} m$$

$$E = 1,4×10^{-17} J$$

For 1 mole:

$$E = 8,4×10^6$$