The stratospheric ozone (O3) layer helps to protect us from harmful ultraviolet

Question

The stratospheric ozone (O3) layer helps to protect us from harmful ultraviolet radiation. It does so by absorbing ultraviolet light and falling apart into an O2 molecule and an oxygen atom, a process known as photodissociation. O3(g)?O2(g)+O(g)

Part A

Use the data in Appendix C in the textbook to calculate the enthalpy change for this reaction. Express your answer using three significant figures. Answer: 105 kJ/mol (I got this one)

Part B ******WHAT I NEED HELP WITH.

What is the maximum wavelength a photon can have if it is to possess sufficient energy to cause this dissociation? Express your answer using four significant figures.

Explanation / Answer

105000 J divided by 6.022 x 10^23 gives J per bond needed

Use E = h (nu) to calculate the frequency of the photon required

1.7436 x 10^-19 = (6.626 x 10^-34) (nu)

Since the units of h are J-sec, you get seconds to the minus one when solving for nu

2.6315 x 10^14 s^-1

Use (lambda) (nu) = c to solve for the wavelength.

Lambda = c/ (nu) = 1.1400 x 10^-6 m

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