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4. Explain why the pin must be replaced into the pinhole during cooling of the flask.

4. Explain why the pin must be replaced into the pinhole during cooling of the flask.

Introduction to General, Organic and Biochemistry
Introduction to General, Organic and Biochemistry
11th Edition
ISBN:9781285869759
Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Publisher:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Chapter5: Gases, Liquids, And Solids
Section: Chapter Questions
Problem 5.26P
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Procedure You are given an UNKNOWN VOLATILE LIQUID. You put 5 mL in a weighed flask tightly capped with a piece of aluminum foil with a pinhole. This is heated in a boiling water bath, until the vapors completely displace all the air, and all of the liquid has evaporated. The pin is replaced. The flask is then cooled to recondense the vapors and weighed. The exact volume of the flask is also determined. Data Atmospheric pressure 23.94 inch Hg Trial Water Initial mass of Final mass of Volume of the Temperature (degrees Celsius) flask, pin and foil (g) flask, foil, pin and recondensed Erlenmeyer Flask (mL) volatile liquid (g) 83.79g 84.23g 84.02g 95 C 83.15g 83.24g 83.3g 1 146mL 2 95 C 148mL 3 95 C 147mL Avg. 147mL Questions 2. Calculate the average volume of the flask using the data from your three measurements. Use this average value to calculate the molar mass of your volatile liquid for each of your three trials of mass determination. (Don't forget to convert your temperature to the absolute scale.) 3. Calculate the average molar mass from your three trials. Calculate the standard deviation in your value for molar mass. (See the popcorn experiment for the equation) 4. Explain why the pin must be replaced into the pinhole during cooling of the flask. 5. Due to the fact that the liquid you used was a volatile one, it will not completely recondense. Some of the liquid remains in the vapor phase, even at room temperature. If you were able to correct for this by making the vapors recondense completely, would your final molar mass value be greater than, less than or the same as the value you determined? Explain your reasoning.
Transcribed Image Text:Procedure You are given an UNKNOWN VOLATILE LIQUID. You put 5 mL in a weighed flask tightly capped with a piece of aluminum foil with a pinhole. This is heated in a boiling water bath, until the vapors completely displace all the air, and all of the liquid has evaporated. The pin is replaced. The flask is then cooled to recondense the vapors and weighed. The exact volume of the flask is also determined. Data Atmospheric pressure 23.94 inch Hg Trial Water Initial mass of Final mass of Volume of the Temperature (degrees Celsius) flask, pin and foil (g) flask, foil, pin and recondensed Erlenmeyer Flask (mL) volatile liquid (g) 83.79g 84.23g 84.02g 95 C 83.15g 83.24g 83.3g 1 146mL 2 95 C 148mL 3 95 C 147mL Avg. 147mL Questions 2. Calculate the average volume of the flask using the data from your three measurements. Use this average value to calculate the molar mass of your volatile liquid for each of your three trials of mass determination. (Don't forget to convert your temperature to the absolute scale.) 3. Calculate the average molar mass from your three trials. Calculate the standard deviation in your value for molar mass. (See the popcorn experiment for the equation) 4. Explain why the pin must be replaced into the pinhole during cooling of the flask. 5. Due to the fact that the liquid you used was a volatile one, it will not completely recondense. Some of the liquid remains in the vapor phase, even at room temperature. If you were able to correct for this by making the vapors recondense completely, would your final molar mass value be greater than, less than or the same as the value you determined? Explain your reasoning.
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Due to the fact that the liquid you used was a volatile one, it will not completely recondense. Some of the liquid remains in the vapor phase, even at room temperature. If you were able to correct for this by making the vapors recondense completely, would your final molar mass value be greater than, less than or the same as the value you determined? Explain your reasoning.

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