Question

Enter your answer in the provided box. Experimentally, the electron affinity of an element can be determined by using a laser light to ionize the anion of the element in the gas phase: X (g) + hy - X(g) + e Referring to the given table, calculate the photon wavelength (in nanometers) corresponding to the electron affinity for oxygen. Element Electron Affinity (kJ/mol) 122 141 195 134 328 349 325 295 nm

Answer 1

Given orggen electron affinity = 141 kJ/mol - Energy (E) = 141K 1/mol E = 141x1633/mor we know that E= he X = nel where h = plancks constant = 6.62x534 tant = 6.62x10 tos c = light velocity = 3x108 m/s .. wavelength 6) = (6.62x10 347.5) cox 141x109 J/mol But 1 mole = 6.02X1023 photons. 1.41X10? Joules = 1 mole energy 141x10"] - XLmole 1 mole 6.02 xio23 on = 23.42x1029 Phodono

-34 (6.62x1045) (3x108m) (23. 42 x10-2015) - = 0.848 x 10-6m 1 = 8.48x10²m = 848 x104m = 848 nm 1m = q 10 nm inm = 1x16m) wave length = 848 nm