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• To determine the freezing point: o Plot the cooling curve in Excel (te

• To determine the freezing point: o Plot the cooling curve in Excel (te

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Follow the instruction in station 2 to calculate the freezing point of the unknown substance used in the example cooling curve show in figure 3 on the experiment file. Report bth the time and temperature of the melting point. Show full work
● To determine the freezing point: o Plot the cooling curve in Excel (temperature on the y-axis vs. time on the x-axis) as shown in the example in figure 3. Plot the data as two series, one where the temperature is changing by more than 0.5 °C per 30 second reading and a second where the temperature is changing by less than 0.5 °C per 30 second reading. Fit each series to a best fit line and display the equations on the chart. Temperature ('C) 85 83 81 79 77 73 71 69 67 65 0 y=-0.0765x + 80.704 100 C103- Introduction to Principles of Chemistry 200 y = -0.0046x + 68.837 +++ 300 3-5 400 Time (s) Figure 3: Example of a cooling curve with two separate data series and two trendlines. 500 States of Matter- Soltds Liquids, and Gases 4
Transcribed Image Text:● To determine the freezing point: o Plot the cooling curve in Excel (temperature on the y-axis vs. time on the x-axis) as shown in the example in figure 3. Plot the data as two series, one where the temperature is changing by more than 0.5 °C per 30 second reading and a second where the temperature is changing by less than 0.5 °C per 30 second reading. Fit each series to a best fit line and display the equations on the chart. Temperature ('C) 85 83 81 79 77 73 71 69 67 65 0 y=-0.0765x + 80.704 100 C103- Introduction to Principles of Chemistry 200 y = -0.0046x + 68.837 +++ 300 3-5 400 Time (s) Figure 3: Example of a cooling curve with two separate data series and two trendlines. 500 States of Matter- Soltds Liquids, and Gases 4
Temp 71 69 67 65 0 100 C103- Introduction to Principles of Chemistry 200 y=-0.0046x + 68.837 3-5 300 400 Time (s) Figure 3: Example of a cooling curve with two separate data series and two trendlines. 500 Station 3: Evaporation. a phase transition from liquid to gas Page < States of Matter-Solids, Liquids, and Gases O Determine the melting point. Tm. for the pure stearic acid sample using the two trendline equations. Find the point where the two lines intersect by setting the two equations equal to one another and solving for "x". Take that "x" and use either equation to determine the temperature at which the equations are equal. The temperature at the intersection of the two lines is the freezing point. Compare your calculated freezing point to the actual melting point by determining the percent error. This unit will use the concepts of Mass and Volume from Week 1.
Transcribed Image Text:Temp 71 69 67 65 0 100 C103- Introduction to Principles of Chemistry 200 y=-0.0046x + 68.837 3-5 300 400 Time (s) Figure 3: Example of a cooling curve with two separate data series and two trendlines. 500 Station 3: Evaporation. a phase transition from liquid to gas Page < States of Matter-Solids, Liquids, and Gases O Determine the melting point. Tm. for the pure stearic acid sample using the two trendline equations. Find the point where the two lines intersect by setting the two equations equal to one another and solving for "x". Take that "x" and use either equation to determine the temperature at which the equations are equal. The temperature at the intersection of the two lines is the freezing point. Compare your calculated freezing point to the actual melting point by determining the percent error. This unit will use the concepts of Mass and Volume from Week 1.
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