1. Calculate the freezing point of a solution of 5.00 g of diphenyl, C₁₂H₁₀, and 7.50 g of naphthalene, C₁₀H₈, dissolved in 200.0 g of benzene (Freezing Point = 5.50 °C; kf = 5.12 °C/m). (NOTE: There is a tiny twist in this problem, but keep in mind that colligative properties are all about how many particles in solution (a.k.a., moles

Depression in freezing point is equal to the product of molality and depression in freezing point constant. ∆Tf=Kf.m m is molality. Kf is depression in freezing point constant. Molality is equal to the number of moles of solute dissolved in per kg of solvent. It is denoted by m. Its SI unit is mol/kg. Molality=MassMolar mass×1000Mass of solvent To determine the freezing point of solution. Given data Mass of diphenyl=5.00g. Mass of naphthalene=7.50g. Mass of benzene=200.0g. Molar mass of diphenyl=154.0g/mol. Molar mass of naphthalene=128.0g/ml. Number of moles of diphenyl=5.00154=0.03246 moles. Number of moles of naphthalene=7.50128=0.05859 moles. Total number of moles=0.03246+0.05859=0.09105 moles. Molality=Number of molesMass of benzene Molality=0.09105 moles0.200 kg=0.455 moles/kg. Vant Hoff factor for nondissociated molecules is 1.0. ∆Tf=iKfm∆Tf=1×5.12oC/m×0.455m=2.33oC ∆Tf=Tof-Tf.2.33=5.50-Tf.Tf=3.17oC.Answer Freezing point of solution is 3.17oC.

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Chemistry

Calculate the freezing point of a solution of 5.00 g of diphenyl, C12H10, and 7.50 g of naphthalene, C10H8, dissolved in 200.0 g of benzene (Freezing Point = 5.50 °C; kfp = 5.12 °C /m).(NOTE: There is a tiny twist in this problem, but keep in mind that colligative properties are all about how many particles in solution (a.k.a., moles ©) and nothing else.

Calculate the freezing point of a solution of 5.00 g of diphenyl, C12H10, and 7.50 g of naphthalene, C10H8, dissolved in 200.0 g of benzene (Freezing Point = 5.50 °C; kfp = 5.12 °C /m).(NOTE: There is a tiny twist in this problem, but keep in mind that colligative properties are all about how many particles in solution (a.k.a., moles ©) and nothing else.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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