# college chemistry

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CH4 + 2 Cl2--> CH2Cl2 + 2HCl

Cl-Cl bond energy: 242 kj/mole

1. Calculate the amount of energy (Joules) needed to break a single Cl-Cl bond.

2. Calculate the longest wavelength of light (meters)that can supply the energy per photon necessary to break the Cl-Cl bond.

• college chemistry -

242 kJ/mol = 242,000 J/mol
242,000 J/mol x (1 mol/6.022 x 10^23 molecules) = E for one molecule in joules.

E = hc/wavelength.

• college chemistry -

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