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The bond dissociation energy of N2 is 480 kJ/mol. Which of the following photon wavelengths is sufficient to dissociate N2 into atoms? (Use: 1 eV per photon = 96 kJ/mol)

1. 2670 Angstrom
2. 2300 Angstrom
3. 3423 Angstrom
4. 3104 Angstrom

Correct answer: 2300 Angstrom

Solution

A photon must carry at least 5 eV to break one N2 molecule. Calculate the corresponding wavelength and pick the option with shorter (more energetic) wavelength.

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