Determination of the freezing point of cyclothexane molar freezing point constan

Question

Determination of the freezing point of cyclothexane molar freezing point constant of cyclohenane + Naphthalene Molarity of cyclohexane solution Freezing pointdepression Freezing point depression constant k_F Molar freezing point constant iof cyclohexane + Naphthelene 2^nd time Mass of test tube, beaker& cyclohexane mass of test tube & beaker Freezing point of depression Molarity of naphthalebne-cyclohexane solution Freezing point depression constant k_f average freezing point depression constant k_f(part B & c)

Explanation / Answer

Molality= moles of solute/kg of solvent

Moles of solute (napthalene)= mass/molecular weight= 0.199/128=0.001555

Molality, m = 0.001555*1000/14.9=0.1043

Freezing point depression= -4.8+6.51=1.71 deg.c

Freezing point depression= Kf*m =Kf*0.1043

Kf= -1.71/0.1043=16.395= Freezing point depression constant

Trial-2

Freezing point depression= -4.1+6.51=2.41 deg.c

Molality= 0.170/128*0.015=0.088542

Kf= 2.41/0.088542=27.22

Average Kf= (27.22+16.4)/2=21.81deg.C/mole

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