General, Organic, and Biological Chemistry
7th Edition
ISBN: 9781285853918
Author: H. Stephen Stoker
Publisher: Cengage Learning
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Chapter 7, Problem 7.42EP
(a)
Interpretation Introduction
Interpretation:
For the given restricted variable, the pressure is constant in the given
(b)
Interpretation Introduction
Interpretation:
For the given restricted variable, the number of moles and the temperature are the constant in the given gas laws has to be chosen.
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Students have asked these similar questions
On the next page is an LC separation of the parabens found in baby wash. Parabens are
suspected in a link to breast cancer therefore an accurate way to quantitate them is desired.
a. In the chromatogram, estimate k' for ethyl paraben. Clearly indicate what values you used for
all the terms in your calculation.
b. Is this a "good" value for a capacity factor? Explain.
c. What is the resolution between n-Propyl paraben and n-Butyl paraben? Again, indicate clearly
what values you used in your calculation.
MAU
| Methyl paraben
40
20
0
-2
Ethyl paraben n-Propyl paraben
n-Butyl paraben
App ID 22925
6
8
min
d. In Figure 4, each stationary phase shows some negative correlation between plate count
and retention factor. In other words, as k' increases, N decreases. Explain this relationship
between k' and N.
Plate Count (N)
4000
3500
2500
2000
1500
1000
Figure 4. Column efficiency (N) vs retention factor (k') for 22
nonionizable solutes on FMS (red), PGC (black), and COZ (green). 3000
Eluent compositions (acetonitrile/water, A/W) were adjusted to obtain
k' less than 15, which was achieved for most solutes as follows: FMS
(30/70 A/W), PGC (60/40), COZ (80/20). Slightly different
compositions were used for the most highly retained solutes. All
columns were 50 mm × 4.6 mm id and packed with 5 um particles,
except for COZ, which was packed with 3 um particles. All other
chromatographic conditions were constant: column length 5 cm,
column j.§. 4.6 mm, flow rate 2 mL/min, column temperature 40 °C,
and injection volume 0.5 μL
Log(k'x/K'ethylbenzene)
FMS
1.5
1.0
0.5
0.0
ཐྭ ཋ ཤྩ བྷྲ ;
500
0
5
10…
f. Predict how the van Deemter curve in Figure 7
would change if the temperature were raised
from 40 °C to 55 °C.
Figure 7. van Desmter curves in reduced coordinates for four
nitroalkane homologues (nitropropane, black; nitrobutane, red;
nitropentane, blue; and nitrohexane, green) separated on the FMS
phase. Chromatographic conditions: column dimensions 50 mm × 4.6
mm id, eluent 30/70 ACN/water, flow rates 0.2-5.0 mL/min, injection
volume 0.5 and column temperature 40 °C. No corrections to the
plate heights have been made to account for extracolumn dispersion.
Reduced Plate Height (h)
°
20
40
60
Reduced Velocity (v)
8. (2) A water sample is analyzed for traces of benzene using headspace analysis. The sample and
standard are spiked with a fixed amount of toluene as an internal standard. The following data are
obtained:
Ppb benzene
Peak area benzene
Peak area toluene
10.0
252
376
Sample
533
368
What is the concentration of benzene in the sample?
Chapter 7 Solutions
General, Organic, and Biological Chemistry
Ch. 7.1 - Prob. 1QQCh. 7.1 - Prob. 2QQCh. 7.1 - Prob. 3QQCh. 7.2 - Prob. 1QQCh. 7.2 - Prob. 2QQCh. 7.2 - Prob. 3QQCh. 7.3 - Prob. 1QQCh. 7.3 - Prob. 2QQCh. 7.3 - Prob. 3QQCh. 7.4 - Prob. 1QQ
Ch. 7.4 - Prob. 2QQCh. 7.4 - Based on Boyles law, if the pressure on 30.0 mL of...Ch. 7.5 - Prob. 1QQCh. 7.5 - Prob. 2QQCh. 7.5 - Prob. 3QQCh. 7.6 - Prob. 1QQCh. 7.6 - Prob. 2QQCh. 7.6 - Prob. 3QQCh. 7.7 - Prob. 1QQCh. 7.7 - Prob. 2QQCh. 7.7 - Prob. 3QQCh. 7.7 - Prob. 4QQCh. 7.8 - Prob. 1QQCh. 7.8 - Prob. 2QQCh. 7.8 - Prob. 3QQCh. 7.9 - Prob. 1QQCh. 7.9 - Prob. 2QQCh. 7.9 - Prob. 3QQCh. 7.10 - Prob. 1QQCh. 7.10 - Prob. 2QQCh. 7.10 - Prob. 3QQCh. 7.11 - Prob. 1QQCh. 7.11 - Prob. 2QQCh. 7.11 - Prob. 3QQCh. 7.11 - Prob. 4QQCh. 7.11 - Prob. 5QQCh. 7.11 - Prob. 6QQCh. 7.12 - Prob. 1QQCh. 7.12 - Prob. 2QQCh. 7.12 - Prob. 3QQCh. 7.13 - Prob. 1QQCh. 7.13 - Prob. 2QQCh. 7.13 - Prob. 3QQCh. 7.13 - Prob. 4QQCh. 7.13 - Prob. 5QQCh. 7.13 - Prob. 6QQCh. 7 - Indicate whether each of the following statements...Ch. 7 - Indicate whether each of the following statements...Ch. 7 - Prob. 7.3EPCh. 7 - Prob. 7.4EPCh. 7 - Prob. 7.5EPCh. 7 - Prob. 7.6EPCh. 7 - Prob. 7.7EPCh. 7 - Prob. 7.8EPCh. 7 - Prob. 7.9EPCh. 7 - Prob. 7.10EPCh. 7 - Prob. 7.11EPCh. 7 - Prob. 7.12EPCh. 7 - Prob. 7.13EPCh. 7 - Prob. 7.14EPCh. 7 - Prob. 7.15EPCh. 7 - Prob. 7.16EPCh. 7 - Prob. 7.17EPCh. 7 - Prob. 7.18EPCh. 7 - A sample of ammonia (NH3), a colorless gas with a...Ch. 7 - A sample of nitrogen dioxide (NO2), a toxic gas...Ch. 7 - Prob. 7.21EPCh. 7 - Prob. 7.22EPCh. 7 - Prob. 7.23EPCh. 7 - Prob. 7.24EPCh. 7 - Prob. 7.25EPCh. 7 - Prob. 7.26EPCh. 7 - A sample of N2 gas occupies a volume of 375 mL at...Ch. 7 - A sample of Ar gas occupies a volume of 1.2 L at...Ch. 7 - Prob. 7.29EPCh. 7 - Prob. 7.30EPCh. 7 - Prob. 7.31EPCh. 7 - Prob. 7.32EPCh. 7 - Prob. 7.33EPCh. 7 - Prob. 7.34EPCh. 7 - Prob. 7.35EPCh. 7 - Prob. 7.36EPCh. 7 - Prob. 7.37EPCh. 7 - Prob. 7.38EPCh. 7 - Prob. 7.39EPCh. 7 - Prob. 7.40EPCh. 7 - Prob. 7.41EPCh. 7 - Prob. 7.42EPCh. 7 - Prob. 7.43EPCh. 7 - Prob. 7.44EPCh. 7 - Prob. 7.45EPCh. 7 - Prob. 7.46EPCh. 7 - Prob. 7.47EPCh. 7 - Prob. 7.48EPCh. 7 - Prob. 7.49EPCh. 7 - Prob. 7.50EPCh. 7 - Determine the following for a 0.250-mole sample of...Ch. 7 - Determine the following for a 0.500-mole sample of...Ch. 7 - Prob. 7.53EPCh. 7 - Prob. 7.54EPCh. 7 - Prob. 7.55EPCh. 7 - What is the value of the ideal gas constant R if...Ch. 7 - The total pressure exerted by a mixture of O2, N2,...Ch. 7 - The total pressure exerted by a mixture of He, Ne,...Ch. 7 - A gas mixture contains O2, N2, and Ar at partial...Ch. 7 - A gas mixture contains He, Ne, and H2S at partial...Ch. 7 - Prob. 7.61EPCh. 7 - Prob. 7.62EPCh. 7 - Prob. 7.63EPCh. 7 - Prob. 7.64EPCh. 7 - Prob. 7.65EPCh. 7 - Prob. 7.66EPCh. 7 - Prob. 7.67EPCh. 7 - Prob. 7.68EPCh. 7 - Prob. 7.69EPCh. 7 - Prob. 7.70EPCh. 7 - Prob. 7.71EPCh. 7 - Prob. 7.72EPCh. 7 - What are the two ways in which the escape of...Ch. 7 - Prob. 7.74EPCh. 7 - Prob. 7.75EPCh. 7 - How does an increase in the surface area of a...Ch. 7 - Prob. 7.77EPCh. 7 - Prob. 7.78EPCh. 7 - Prob. 7.79EPCh. 7 - Prob. 7.80EPCh. 7 - Prob. 7.81EPCh. 7 - What is the relationship between the strength of...Ch. 7 - What term is used to describe a substance that...Ch. 7 - Prob. 7.84EPCh. 7 - Indicate whether each of the following statements...Ch. 7 - Indicate whether each of the following statements...Ch. 7 - Prob. 7.87EPCh. 7 - What is the relationship between location...Ch. 7 - Prob. 7.89EPCh. 7 - Prob. 7.90EPCh. 7 - Indicate whether or not each of the following...Ch. 7 - Prob. 7.92EPCh. 7 - Prob. 7.93EPCh. 7 - Prob. 7.94EPCh. 7 - For liquid-state samples of the following diatomic...Ch. 7 - For liquid-state samples of the following diatomic...Ch. 7 - Prob. 7.97EPCh. 7 - Prob. 7.98EPCh. 7 - Prob. 7.99EPCh. 7 - Prob. 7.100EPCh. 7 - Prob. 7.101EPCh. 7 - Prob. 7.102EPCh. 7 - Prob. 7.103EPCh. 7 - Prob. 7.104EPCh. 7 - Prob. 7.105EPCh. 7 - Prob. 7.106EP
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