# college chemistry

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.

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1. 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.

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2. 24

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3. Calculate the total energy required to break bonds of the reactants if c-h is 414 kj mol
O-h 460 kj mol
o=o 499
c=o 799 kj mol

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4. Ch4+2h2o ›2h2oo+co2+energy c-h 414 kj mol
o-h 460 kj mol
o=o 499 kj mol
c=h 799 kj mol

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