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Prelaboratory Questions Name Laboratory Section Show your work, include units, and report the correct number of significant figures for all calculations. 1. The molal freezing point depression constant (K;) for p-dichlorobenzene is 7.10°C/m and its normal freezing point (f.p.) is 53.10°C.When 0.304 g of an unknown solute is dissolved in 3.78 g of p-dichlorobenzene, the f.p. is lowered to 49.60°C. Refer to the Introduction and Data Sheet to solve the following problems. a) The f.p. depression (AT;) is °C. b) Calculate the molality (m) of the solution. c) Calculate the number of moles of solute in the solution. d) Calculate the molar mass of the unknown solute. (continued on next page) 101

Prelaboratory Questions Name Laboratory Section Show your work, include units, and report the correct number of significant figures for all calculations. 1. The molal freezing point depression constant (K;) for p-dichlorobenzene is 7.10°C/m and its normal freezing point (f.p.) is 53.10°C.When 0.304 g of an unknown solute is dissolved in 3.78 g of p-dichlorobenzene, the f.p. is lowered to 49.60°C. Refer to the Introduction and Data Sheet to solve the following problems. a) The f.p. depression (AT;) is °C. b) Calculate the molality (m) of the solution. c) Calculate the number of moles of solute in the solution. d) Calculate the molar mass of the unknown solute. (continued on next page) 101

Chemistry
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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EXPERIMENT Determination of Molar Mass by the Freezing Point Depression Method 12 Prelaboratory Questions Name Laboratory Section Show your work, include units, and report the correct number of significant figures for all calculations. 1. The molal freezing point depression constant (K;) for p-dichlorobenzene is 7.10°C/m and its normal freezing point (f.p.) is 53.10°C.When 0.304 g of an unknown solute is dissolved in 3.78 g of p-dichlorobenzene, the f.p. is lowered to 49.60°C. Refer to the Introduction and Data Sheet to solve the following problems. a) The f.p. depression (ATf) is °C. b) Calculate the molality (m) of the solution. c) Calculate the number of moles of solute in the solution. d) Calculate the molar mass of the unknown solute. (continued on next page) 101 р. 101
Transcribed Image Text:EXPERIMENT Determination of Molar Mass by the Freezing Point Depression Method 12 Prelaboratory Questions Name Laboratory Section Show your work, include units, and report the correct number of significant figures for all calculations. 1. The molal freezing point depression constant (K;) for p-dichlorobenzene is 7.10°C/m and its normal freezing point (f.p.) is 53.10°C.When 0.304 g of an unknown solute is dissolved in 3.78 g of p-dichlorobenzene, the f.p. is lowered to 49.60°C. Refer to the Introduction and Data Sheet to solve the following problems. a) The f.p. depression (ATf) is °C. b) Calculate the molality (m) of the solution. c) Calculate the number of moles of solute in the solution. d) Calculate the molar mass of the unknown solute. (continued on next page) 101 р. 101
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