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# The energy required to break one mole of

Question:

The energy required to break one mole of $\mathrm{Cl}-\mathrm{Cl}$ bonds in $\mathrm{Cl}_{2}$ is $242 \mathrm{~kJ} \mathrm{~mol}^{-1}$. The longest wavelength of light capable of breaking a single $\mathrm{Cl}-\mathrm{Cl}$ bond is

$\left(\mathrm{C}=3 \times 10^{8} \mathrm{~ms}^{-1}\right.$ and $\left.\mathrm{N}_{\mathrm{A}}=6.02 \times 10^{23} \mathrm{~mol}^{-1}\right)$

1. $494 \mathrm{~nm}$

2. $594 \mathrm{~nm}$

3. $640 \mathrm{~nm}$

4. $700 \mathrm{~nm}$

Correct Option: 1

Solution: