lab 2 - Q# Question Text 4) Part I. The expresssion for the...

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Q# Question Text 4) Part I. The expresssion for the freezing point depression of a solution relative to that of the pure solute is shown above. From solutions of known concentrations of p -dichlorobenzene in cyclohexane, you determine K f , the freezing point depression constant of cyclohexane. What assumption is necessary in order to do these calculations? Enter your answer in the text box displayed. Your Answer: The assumption that is necessary is i. We need to know how many parts dicholorobenzine breaks into. Text Answers to be Scored by your TA 5) Data Entry - No Scoring Part I. How many trials of the determination of the freezing point of cyclohexane did you perform? n = Your Answer: 4 No Points Possible 6) Data Entry - No Scoring Part I. Please enter the values in Celsius to the nearest 0.2 o that you obtained for the freezing point of cyclohexane for each of the NCount trials you performed. T f = Your Answer: 9 No Points Possible Your Answer: 9 No Points Possible Your Answer: 9 No Points Possible Your Answer: 9 No Points Possible 7) Scoring Scheme: 3-3-2-1 Part I. Please enter the result for the average of the trials of your determination of the freezing point of cyclohexane in Celsius to the nearest tenth of a degree. T f = Your Answer: 9 You Scored 3 points out of 3 Possible 8) Data Entry - No Scoring Part I. Please enter the volume in mL of cyclohexane to the nearest hundredth of a mL, e.g. 9.99 mL, that you used to prepare the p-dichlorobenzene solution, the freezing point of which you subsequently measured. Volume (ml) = Your Answer: 10 No Points Possible 9) Scoring Scheme: 2-1
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The density of cyclohexane may be taken to be 0.7726 g/mL. Considering the volume of cyclohexane that you used to prepare the the p-dichlorobenzene solution, calculate the mass in grams of cyclohexane. Enter the mass to the nearest thousandth of a gram. mass cyclohexane (g) = Your Answer: 7.726 You Scored 2 points out of 2 Possible 10) Data Entry - No Scoring Part II. Please enter the mass of p -dichlorobenzene that you used to prepare your solution in part II of the experiment to a thousandth of a gram, e. g. 0.577 g. mass p -dichlorobenzene (g) = Your Answer: 0.561 No Points Possible 11) Scoring Scheme: 3-3-2-1 Part II. The molality of a solution is the number of moles of the solute that is dissolved in 1000 g of solvent. Using the values for the mass of
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This lab report was uploaded on 04/17/2008 for the course CHE 2b taught by Professor Augustine during the Winter '07 term at UC Davis.

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lab 2 - Q# Question Text 4) Part I. The expresssion for the...

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