Chemistry for Engineering Students
4th Edition
ISBN: 9780357026991
Author: Brown
Publisher: CENGAGE Learning Custom Publishing
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Chapter 10, Problem 10.26PAE
Interpretation Introduction
Interpretation: To understand the reason the surroundings of a system is always considered when applying the second law of
Concept Introduction: According to the second law of thermodynamics entropy of a spontaneous process always increases.
ΔStotal= ΔSsys + ΔSsurr > 0
Where,
ΔStotal= total entropy change for the process
ΔSsys = entropy change of the system
ΔSsurr = entropy change of the surrounding
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In the video, we looked at the absorbance of a certain substance and how it varies
depending on what wavelength of light we are looking at. Below is a similar scan of a
different substance. What color BEST describes how this substance will appear?
Absorbance (AU)
Violet
Blue
Green
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1.2
1.0-
0.8-
0.6-
0.4-
0.2
0.0
450
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550
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violet
indigo
blue
green
yellow orange
red
Red
O Cannot tell from this information
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absorbance than light with a -550 nm wavelength? Check all that are true.
The distance the light travels is different
The different data points are for different substances
The concentration is different at different times in the experiment
Epsilon (molar absortivity) is different at different wavelengths
5. a. Data were collected for Trial 1 to determine the molar mass of a nonvolatile solid solute when dissolved in cyclo-
hexane. Complete the table for the analysis (See Report Sheet). Record calculated values with the correct number
of significant figures.
B. Freezing Point of Cyclohexane plus
Calculation Zone
Unknown Solute
2. Mass of cyclohexane (g)
10.14
Part C.4
3. Mass of added solute (g)
0.255
C. Calculations
1. k; for cyclohexane (°C⚫ kg/mol)
20.0
2. Freezing point change, AT, (°C)
3.04
Part C.6
3. Mass of cyclohexane in solution (kg)
4. Moles of solute, total (mol)
Show calculation.
5. Mass of solute in solution, total (g)
6. Molar mass of solute (g/mol)
Show calculation.
Chapter 10 Solutions
Chemistry for Engineering Students
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