LAB SECTION DATE NAME EXERCISE 12 Report Data and Results A. Molal Freezing-Poin

Question

LAB SECTION DATE NAME EXERCISE 12 Report Data and Results A. Molal Freezing-Point Depression Constant of Cyclohexane Trial 1 Trial Mass of test tube and cyclohexane Mass of test tube Mass of cyclohexane Freezing point of pure cyclohexane Mass of naphthalene and paper Mass of paper Total mass of naphthalene in solution Freezing point of solution reezing-point depression, AT Molality of solution, m Molal freezing-point constant Average k Kolecular Weight of an Unknowi tolotein Trial 1 Trial 2 Mass of test tube and cyclohexane Mass of test tube Mass of solvent Mass of sample and paper Mass of paper Total mass of solid sample in solution Freezing point of solvent (from part A) Freezing point of solution Freezing-point depression, AT Apparent molality of solution Grams of solute ner l lo.tt 1361 30

Explanation / Answer

freezing point depression= freezing point of pure solvent - freezing point of solution

molality= moles of solute per kg of solution

Kf= freezing point depression/molality

average Kf= average of the two values

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