Final answer:
The energy of a mole of photons is calculated by determining the energy of a single photon using the wavelength and then multiplying by Avogadro's number, 6.022 × 1023.
Step-by-step explanation:
To calculate the energy of one mole of photons, first, we need the equation for the energy of a single photon, which is E = hc/λ, where E is the energy, h is Planck's constant (6.626 × 10-34 J × s), c is the speed of light (3 × 108 m/s), and λ is the photon's wavelength in meters. After determining the energy of one photon using the provided wavelength from Exercise 29.25, we multiply this value by Avogadro's number (6.022 × 1023) to obtain the energy of a mole of photons.