Question

the energy required to break one mole of chlorine- chlorine bonds in Cl2 is 242 kj/mol. what is the longest wavelength of light capable of breaking a single Cl-Cl bond?

Answer 1

242 kJ/mol. Convert t J and divide by 6.022E23 to convert to 1 molecule. Then
E = hc/wavelength

Answer 2

Thank you I got 494 nm

Answer 3

I may may have punched in a wrong number on my calculator but I obtained 494.65 nm which would round to 495 nm.