Atomic Structure Question 191

Question: The energy required to break 1 mol of $ Cl-Cl $ bonds in $ Cl_2 $ is 242 kJ/mol. The longest wavelength of light capable of breaking a single $ Cl-Cl $ bond is

Options:

A) 594 nm

B) 640 nm

C) 700 nm

D) 494 nm

Show Answer

Answer:

Correct Answer: D

Solution:

  • Energy required for 1 $ Cl_2 $ molecule $ =\frac{242\times 10^{3}}{N_{A}}J $

$ E=\frac{hc}{\lambda } $ or $ \lambda =\frac{hc}{E} $

$ =\frac{6.626\times {10^{-34}}\times 3\times 10^{8}\times 6.02\times 10^{23}}{242\times 10^{3}} $

$ =494\times {10^{-9}}m=494nm $



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