Moody [1] studied the efficiency of a GC separation of 2-butanone on a dinonyl phthalate column. Evaluating plate height as a function of flow rate gave a van Deemter equation for which A is 1.65 mm, B is 25.8 mm •mL/min, and C is 0.0236 mm-min/mL. a) Using Microsoft Excel, plot a graph of H versus u for flow rates

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Moody [1] studied the efficiency of a GC separation of
2-butanone on a dinonyl phthalate column. Evaluating
plate height as a function of flow rate gave a van
Deemter equation for which A is 1.65 mm, B is 25.8 mm
*mL/min, and C is 0.0236 mm-min/mL. a) Using
Microsoft Excel, plot a graph of H versus u for flow rates
in the range of 5 - 120 mL/min. Your graph must
include curves due to the contributions of all the terms (
i.e. curve for A, B and C and the overall curve) b) For
what range of flow rates does each term in the Van
Deemter equation have the greatest effect? c) How
much is the optimum flow rate for this column? d) How
much is the height of a theoretical plate for the flow
rate in part C ?
Transcribed Image Text:Moody [1] studied the efficiency of a GC separation of 2-butanone on a dinonyl phthalate column. Evaluating plate height as a function of flow rate gave a van Deemter equation for which A is 1.65 mm, B is 25.8 mm *mL/min, and C is 0.0236 mm-min/mL. a) Using Microsoft Excel, plot a graph of H versus u for flow rates in the range of 5 - 120 mL/min. Your graph must include curves due to the contributions of all the terms ( i.e. curve for A, B and C and the overall curve) b) For what range of flow rates does each term in the Van Deemter equation have the greatest effect? c) How much is the optimum flow rate for this column? d) How much is the height of a theoretical plate for the flow rate in part C ?
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