The freezing point of benzene C6H6 is 5.50°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in benzene is DDT .
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) =?
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
FOR FREEZING POINT OF SOLUTION
∆T = -Kf m
T2-5.50= -(5.12) (0.1850)
T2 = -0.9474 +5.50
T2 = 4.5526C0
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