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The energy required to break one mole of hydrogen-hydrogen bonds in H ₂ is 436 kJ . What is the longest wavelength of light required to break a single hydrogenhydrogen bond?

Options

  1. A68.5 nm
  2. B137 nm
  3. C274 nm
  4. D548 nm

Correct answer

C. 274 nm

Step-by-step solution

Given, energy of one mole of H ₂ bonds =436 k J array l E= n h c = n.h c E = 6.634 10⁻ 34 s 3 10³ ms ⁻¹ 6.023 10²³ 436 10³ J m =0.2736 10⁻³⁴⁺⁸⁺²³⁻³ =0.2736 10⁻⁶ m =273.6 nm =274 nm array

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