The energy required to break one mole of Cl – Cl bonds in Cl2 is 242 kJ mol–1. The longest wavelength of light capable of breaking a single Cl – Cl bond is

Q. The energy required to break one mole of Cl – Cl bonds in Cl2 is 242 kJ mol–1. The longest wavelength of light capable of breaking a single Cl – Cl bond is

(c = 3 ´ 108 ms–1 and NA = 6.02 ´ 1023 mol–1)

A.            594 nm

B.            640 nm

C.            700 nm

D.            494 nm

Answer: 494 nm