Existing stockpiles of therefrigerant Freon-12 (molecular formula CF2Cl2) have t

Question

Existing stockpiles of therefrigerant Freon-12 (molecular formula CF2Cl2) have to be destroyedbecause it

(and other Freons) leadsto the depletion of the ozone layer when released into theatmosphere. One method

is to pass gaseousFreon-12 through a bed of powdered sodium oxalate at 270C.

The following reactionoccurs:

CF2Cl2 + Na2C2O4--->NaF + NaCl + C +CO2

(a) Balance theequation.

(b) Determine the mass (in kg) ofsodium oxalate (Na2C2O4)needed to destroy 147000 kg of Freon-12.

Explanation / Answer

(a) CF2Cl2 + 2Na2C2O4   ----->   2NaF + 2 NaCl + C + 4CO2 (b) 2 moles of sodium oxalate are required to consume 1 mole ofFreon-12 Moles of Freon -12 = mass / molar mass                              =147000 * 103 g / 120.91 g/mol                              = 1.2 *106   moles . Mass of sodium oxalate required = 1.2 * 106 moles Freon* (2 moles sodium oxalate/ 1 mole freon)                                                     * (134 g/ 1 mol sodiumoxalte)                                               = 3.2 * 108 g                                               = 3.2 * 105  kg

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