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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