The longest wavelength of light with enough energy to break the cl-cl bond in cl2(g) is 495 nm.
1) calculate the frequency in s-1 of the light2) calculate the energy in j of a photon of the light3) calculate the minimun energy in kj mol-1 of the cl-cl bond

Explanation:

The longest wavelength of light with enough energy to break the Cl-Cl bond = 495 nm =

1) The frequency of the light:

c = speed of light=

The frequency of the light is .

2)The energy of a photon of the light:

The energy of the photon is given by : E

h =  Planck's constant =

The energy of a photon of the light is .

3) The minimum energy of the Cl-Cl bond :

To break single bond of Cl-Cl bond we need energy E=

1 mole =

So, in order to break 1 mole of Cl-Cl bond we will need:

The minimum energy of the Cl-Cl bond is 241.83 kJ/mol.

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