What is the energy in joules of a mole of photons with the energy of the 434 nm spectral line of hydrogen?

Question

Quizplus · Accepted Answer

The energy of a single photon is calculated using E = hc/λ, where h is Planck's constant (6.626 × 10^-34 J·s), c is the speed of light (3.00 × 10^8 m/s), and λ is the wavelength (434 nm = 434 × 10^-9 m). The energy of a mole of photons is then E × Avogadro's number (6.022 × 10^23 mol^-1). This calculation gives approximately 2.76 × 10^5 J.

What Is the Energy in Joules of a Mole of Photons