Chemistry (OER)
2nd Edition
ISBN: 9781947172616
Author: OpenStax
Publisher: OpenStax College
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Textbook Question
Chapter 3, Problem 31E
Which of the following represents the least number of molecules?
- 20.0 g of H2O (18.02 glmol)
- 77.0 g of CH4 (16.06 glmol)
- 68.0 g of CaH2 (42.09 g/mol)
- 100.0 g of N2O (44.02 g/mol)
- 840 g of HF (20.01 g/mol)
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How would you use infrared spectroscopy to distinguish between the following pairs of constitutional isomers?
(a)
CH3C=CCH3
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and
CH3CH2C=CH
(b)
CH3CCH=CHCH3
and
CH3CCH2CH=CH2
Problem 12-41
The mass spectrum (a) and the infrared spectrum (b) of an unknown hydrocarbon are shown. Propose as many
structures as you can.
(a)
100
Relative abundance (%)
80
60
60
40
200
20
(b)
100
Transmittance (%)
10
20
20
80-
60-
40-
20
40
60
80
100
120
140
m/z
500
4000 3500
3000
2500
2000
1500
Wavenumber (cm-1)
1000
Propagation of uncertainty. You have a stock solution certified by the manufacturer to contain 150.0±0.03 µg SO42-/mL. You would like to dilute it by a factor of 100 to obtain 1.500 µg/mL. Calculate the uncertainty in the two methods of dilution below. Use the following uncertainty values for glassware:
Glassware
Uncertainty
(assume glassware has been calibrated and treat the values below as random error)
1.00 mL volumetric pipet
0.01 mL
10.00 mL volumetric pipet
0.02 mL
100.00 mL volumetric flask
0.08 mL
Transfer 10.00 mL with a volumetric pipet and dilute it to 100 mL with a volumetric flask. Then take 10.00 mL of the resulting solution and dilute it a second time with a 100 mL flask.
2. Transfer 1.00 mL with a volumetric pipet and dilute it to 100 mL with a volumetric flask.
Draw all resonance structures for the following ion:
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Chapter 3 Solutions
Chemistry (OER)
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