Sapling 23

[Jade Lastra 3B]

Could someone help me understand exactly how to break down this question and set up the equation?

[Valerie Tran 2B]

First, you need to determine E using E = hc/wavelength (use 1064x10^-9) for wavelength. You would get 1.867x10^-19. Then you use the conversion for Joules to eV by dividing E by 1.602x10^-19 to get 1.165eV. Electron affinity is the difference between the incident radiation from the laser and the measured energy of the electrons(0.137eV). So 1.165-0.137=1.028 eV/atom

For the second part just use your conversion factors to change 1.028eV/atom to kJ/mol
1.028(1.602x10^-19)(1/1000)(6.022x10^23)=99.21kJ/mol

[Katie Phan 1K]

Valerie explained it perfectly!
Just find the energy of the light, convert it to eV, subtract the experimentally measured energy of ejected electrons, then convert the electron affinity to kJ/mole.