Question

- The energy required to break one mole of hydrogen-
hydrogen bonds in H, is 436 kJ. What is the longest
wavelength of light required to break a single hydrogen
hydrogen bond?
(a) 68.5 nm
(b) 137 nm
(c) 274 nm
(d) 548 nm ​

Answer 1

Answer:

The energy required to break one mole of hydrogen-hydrogen bonds in H2 is 436 kJ or 436,000 J.

The energy required to break a single hydrogen-hydrogen bond is 6.023×1023436,000 J.

λ=Ehc=6.023×1023436,0006.626×10−34×3×108=274×10−9m=274nm

Hence, the longest wavelength of light required to break a single hydrogen-hydrogen bond is 274 nm.