What Is the Maximum Wavelength to Break the Weakest Bond in AsClF42-?

AI Thread Summary
The discussion revolves around calculating the maximum wavelength of electromagnetic radiation that can break the weakest bond in the AsClF42- molecule, using provided bond energy values. The user expresses confusion about how to derive bond energies for As-Cl and Cl-F from the given data, which includes As-As, F-F, and Cl-Cl bond energies. They suggest that the bond energies provided may be inaccurate or "dummy" values, as they differ from established literature. The user attempts to find a solution by averaging the bond energies but finds this approach ineffective. Clarification on the correct method to calculate the bond energies is sought, emphasizing the need for accurate data to solve the problem.
guiromero
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Mentor's Note: Post moved to homework forum from chemistry forum.

Hello,

I have a doubt in anexercise from MIT:
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Calculate the maximum wavelength, λ, of electromagnetic radiation capable of breaking the weakest bond in of AsClF42-.

Bond Energies (kJ/mol): As-As 180; F-F 160; Cl-Cl 240.

Enter the numerical value of λ in meters:
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This molecule has As-Cl and Cl-F bonds, but I don't know how to calculate these bonds energies from the given values. Does anynone know how to do that?

Thanks a lot.
 
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Could there be a previous question with some additional information? Because the question cannot be answered with the data given.
 
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There's a previous question simliar to that, but I can't find the statement. However, I know the formulas are:

Energy (J) = [BE * 1000] / Avogador's number

Where:
BE: Bond energy (KJ/mol)

Wavelength (m) = (h * c) / Energy

Where:
h: Plancks' constant (m^2 * kg * s^-1)
c: Speed of light (m * s^-1)

In this case, BE should be the smallest value among the bond energies found in the molecule. I find that this molecule only has two types of bonds: As-Cl and Cl-F. However, I don't know how to calculate any of these bonds' energies from the data given (Bond energies of As-As 180; F-F 160; Cl-Cl 240).

I thought of taking the mean value of two given bond energies, for example :

Bond energy of As-Cl = (Bond energy of As-As + Bond energy of Cl-Cl) / 2

But this didn't work. Do you know how to do that?
 
Are the given bond energies dummy values? Because literature says As-As is around 380 kJ/mol.[1][2]
 
Mayhem said:
Are the given bond energies dummy values? Because literature says As-As is around 380 kJ/mol.[1][2]
As they are different from the literature values, I suppose they are dummy. Thanks for your help.
 
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