The freezing point of benzene C6H6 is 5.50°C at 1 atmosphere. A nonvolatile, non


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The freezing point of benzene C6H6 is 5.50°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in benzene is DDT 


If 13.33 grams of DDTC14H9Cl5 (354.5 g/mol), are dissolved in 203.2 grams ofbenzene ...

The molality of the solution is  m.

The freezing point of the solution is  °C.
May 28th, 2015

DATA:

Freezing point of benzene (T1)= 5.50C0

Mass of benzene= 203.2g

Mass of DDT= 13.33g

Molality of solution = ?

Freezing point of solution (T2) =?

SOLUTION:

FOR MOLALITY

moles of DDT = mass of DDT/molecular mass of DDT

moles of DDT = 13.33/354.5

moles of DDT = 0.0376mol DDT


m= moles of DDT/ kg of benzene

m= 0.0376/0.232

m= 0.1850m


FOR FREEZING POINT OF SOLUTION

∆T = -Kf m

T2-5.50= -(5.12) (0.1850)

T2 = -0.9474 +5.50

T2 = 4.5526C0


May 28th, 2015

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