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The lab report (often listed as Experiment 14 in chemistry courses) is a common laboratory exercise used to determine the molar mass of an unknown substance through freezing point depression , a colligative property. Key Components of the Report

The final result is found by dividing the mass of the solute used by the number of moles calculated. Typical Lab Report Values freewebmaps

The freezing point is measured again after a known mass of an unknown solid solute is added to the solvent. Calculation of ΔTfcap delta cap T sub f : This is the change in freezing point, calculated as: The lab report (often listed as Experiment 14

ΔTf=Tf,solvent−Tf,solutioncap delta cap T sub f equals cap T sub f comma solvent end-sub minus cap T sub f comma solution end-sub Using the formula Kfcap K sub f for cyclohexane is approximately ), you find the molality and then the moles of solute. Calculation of ΔTfcap delta cap T sub f

Usually, cyclohexane is used as the solvent. Its pure freezing point is recorded from a cooling curve.

Reports available on academic platforms like Studocu and Chegg often show: ~8-10 grams. Kfcap K sub f for Cyclohexane: Solute Mass: Roughly 0.2 to 0.5 grams per trial.