Chemistry
10th Edition
ISBN: 9781305957664
Author: ZUMDAHL, Steven S.
Publisher: Cengage Learning,
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Chapter 10, Problem 152CP
You are asked to help set up a historical display in the park by stacking some cannonballs next to a Revolutionary War cannon. You are told to stack them by starting with a triangle in which each side is composed of four touching cannonballs. You are to continue stacking them until you have a single ball on the top centered over the middle of the triangular base.
a. How many cannonballs do you need?
b. What type of closest packing is displayed by the cannonballs?
c. The four corners of the pyramid of cannonballs form the corners of what type of regular geometric solid?
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Using reaction free energy to predict equilibrium composition
Consider the following equilibrium:
2NH3 (g) = N2 (g) +3H₂
—N2 (g) AGº = 34. kJ
Now suppose a reaction vessel is filled with 4.19 atm of ammonia (NH3) and 9.94 atm of nitrogen (N2) at 378. °C. Answer the following questions about this
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Under these conditions, will the pressure of NH 3 tend to rise or fall?
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yes
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Identifying the major species in weak acid or weak base equilibria
The preparations of two aqueous solutions are described in the table below. For each solution, write the chemical formulas of the major species present at
equilibrium. You can leave out water itself.
Write the chemical formulas of the species that will act as acids in the 'acids' row, the formulas of the species that will act as bases in the 'bases' row, and the
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You will find it useful to keep in mind that HF is a weak acid.
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solution.
acids:
П
bases:
Х
other: ☐
ப
acids:
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Using reaction free energy to predict equilibrium composition
Consider the following equilibrium:
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Now suppose a reaction vessel is filled with 1.68 atm of dinitrogen tetroxide (N204) at 148. °C. Answer the following questions about this system:
rise
Under these conditions, will the pressure of N2O4 tend to rise or fall?
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fall
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be changed to a tendency to fall by adding NO2? Similarly, if you said the
pressure of N2O4 will tend to fall, can that be changed to a tendency to
rise by adding NO2?
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Chapter 10 Solutions
Chemistry
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