A mole of red photons of wavelength 725 nm has ________ kJ of energy. A)2.74 × 10^-19 B)4.56 × 10^-46 C)6.05 × 10^-3 D)165 E)227

Question

Quizplus · Accepted Answer

The energy of a mole of photons is given by the equation E = Nhc/λ, where N is Avogadro's number, h is Planck's constant, c is the speed of light, and λ is the wavelength. Plugging in the given values, we get E = (6.022 × 10^23 mol^-1)(6.626 × 10^-34 J s)(3 × 10^8 m s^-1)/(725 × 10^-9 m) = 165 kJ.

A Mole of Red Photons of Wavelength 725 Nm Has