Elements Of Physical Chemistry
Elements Of Physical Chemistry
7th Edition
ISBN: 9780198727873
Author: ATKINS, P. W. (peter William), De Paula, Julio
Publisher: Oxford University Press
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Chapter 1, Problem 1A.4ST
Interpretation Introduction

Interpretation:

The partial pressures of a sample of gas consisting of 2.50 g oxygen and 6.43 g of carbon dioxide with a total pressure of 88 kPa  has to be calculated.

Concept Introduction:

Mole fractions:

The number of moles of sample id divided by total mole to give mole fraction of sample that present in given mixture.

For example, mole fraction of A in AB mixture is,

     xA=nAnA+nBWhere, xA-molefractionofA nA-numberofmoleofA nB-numberofmoleofB

Partial pressure:

The pressure for the each individual gas to contributing the total pressure for gaseous mixture is known as partial pressure.

For example, partial pressure for A in AB gaseous mixture is,

     pA=xA×PtWhere, pA-partial pressureforA xA-molefractionofA Pt-totalpressure

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fcrip = ↓ bandwidth Il temp 32. What impact (increase, decrease, or no change) does each of the following conditions have on the individual components of the van Deemter equation and consequently, band broadening? Increase temperature Longer column Using a gas mobile phase instead of liquid Smaller particle stationary phase Multiple Paths Diffusion Mass Transfer
34. Figure 3 shows Van Deemter plots for a solute molecule using different column inner diameters (i.d.). A) Predict whether decreasing the column inner diameters increase or decrease bandwidth. B) Predict which van Deemter equation coefficient (A, B, or C) has the greatest effect on increasing or decreasing bandwidth as a function of i.d. and justify your answer. Figure 3 Van Deemter plots for hydroquinone using different column inner diameters (i.d. in μm). The data was obtained from liquid chromatography experiments using fused-silica capillary columns packed with 1.0-μm particles. 35 20 H(um) 큰 20 15 90 0+ 1500 100 75 550 01 02 594 05 μ(cm/sec) 30 15 10
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