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Posted by on Saturday, February 26, 2011 at 11:51pm.

The company you work for plans to release a waste stream containing 7 mg/L
of benzaldehyde . Assuming that benzaldehyde degrades according to the reaction:
C7H6O + 8O2 → 7CO2 + 3H2O
Calculate the theoretical carbonaceous oxygen demand of this waste stream in mg/L.

  • Environmental engineering - , Tuesday, November 15, 2016 at 12:23am

    Molecular Weights:
    C7H6O = 106g/mol = 106mg/mmol
    O2 = 32g/mol = 32mg/mmol

    Stoichiometry Demand:
    8 moles of O2 are needed per 1 mole of C7H6O

    Therefore:
    (8mol-O2)/(1mol-C7H6O) * (32g/mol)/(106g/mol) * 7mg/L

    All units will cancel except mg/L:
    8*(32/106)*7 = 16.906 mg/L

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