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Some ethylene glycol, HOCH2CH2OH , is added to your car’s cooling system along with 5.0 kg...

Some ethylene glycol, HOCH2CH2OH , is added to your car’s cooling system along with 5.0 kg of water. If the freezing point of the water–glycol solution is −13.0 °C, what mass of HOCH2CH2OH must have been added? (Kfp for H2O is −1.86 °C/m.)

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Answer #1

Tf = 0 - (-13) = 13.0 °C

Kf = 1.86 °C/m

Tf =   Kf x molality

13 = 1.86 x molality

molality = 6.99 m

moles of solute = molality x mass of solvent

                         = 6.99 x 5.0

                         = 34.95

mass = 34.95 x molar mass

         = 34.95 x 62

        = 2167 g

mass of ethylene glycol = 2167 g

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