Physical Chemistry
2nd Edition
ISBN: 9781133958437
Author: Ball, David W. (david Warren), BAER, Tomas
Publisher: Wadsworth Cengage Learning,
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Chapter 3, Problem 3.28E
A sample of (ideal) gas from a compressed gas cylinder goes from
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Given a system with an anodic overpotential, the variation of η as a function of current density- at low fields is linear.- at higher fields, it follows Tafel's law.Calculate the range of current densities for which the overpotential has the same value when calculated for both cases (the maximum relative difference will be 5%, compared to the behavior for higher fields).
Using reaction free energy to predict equilibrium composition
Consider the following equilibrium:
N2 (g) + 3H2 (g) = 2NH3 (g) AGº = -34. KJ
Now suppose a reaction vessel is filled with 8.06 atm of nitrogen (N2) and 2.58 atm of ammonia (NH3) at 106. °C. Answer the following questions about this
system:
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Under these conditions, will the pressure of N2 tend to rise or fall?
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Is it possible to reverse this tendency by adding H₂?
In other words, if you said the pressure of N2 will tend to rise, can that be
changed to a tendency to fall by adding H2? Similarly, if you said the
pressure of N will tend to fall, can that be changed to a tendency to rise
by adding H₂?
If you said the tendency can be reversed in the second question, calculate
the minimum pressure of H₂ needed to reverse it.
Round your answer to 2 significant digits.
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no
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Ar
Four liters of an aqueous solution containing 6.98 mg of acetic acid were prepared. At 25°C, the measured conductivity was 5.89x10-3 mS cm-1. Calculate the degree of dissociation of the acid and its ionization constant.Molecular weights: O (15.999), C (12.011), H (1.008).Limiting molar ionic conductivities (λ+0 and λ-0) of Ac-(aq) and H+(aq): 40.9 and 349.8 S cm-2 mol-1.
Chapter 3 Solutions
Physical Chemistry
Ch. 3 - Decide whether the following processes will be...Ch. 3 - Try to find one additional example of a...Ch. 3 - Consider the following quantities for a...Ch. 3 - Consider the following quantities for a four-step...Ch. 3 - What is the temperature of the low-temperature...Ch. 3 - What is the temperature of the high - temperature...Ch. 3 - Prob. 3.7ECh. 3 - Explain why the high-temperature reservoir of a...Ch. 3 - Superheated steam is steam with a temperature...Ch. 3 - Prob. 3.10E
Ch. 3 - The Carnot cycle is defined as having a certain...Ch. 3 - In thermodynamics, the pathway in a...Ch. 3 - A refrigerator is the reverse of an engine: Work...Ch. 3 - Efficiency is given by equations 3.5, 3.6, and...Ch. 3 - What is the entropy change for an ideal Carnot...Ch. 3 - What is the entropy change for the melting of...Ch. 3 - What is the entropy change for the solidification...Ch. 3 - Explain why the statement No process is 100...Ch. 3 - What is the change in entropy of 1.00mole of water...Ch. 3 - Prob. 3.20ECh. 3 - One mole of He warms up irreversibly at constant...Ch. 3 - Consider a monatomic ideal gas in a piston...Ch. 3 - A 0.500-mol sample of an ideal gas has an initial...Ch. 3 - SO2 in a piston chamber kept in a...Ch. 3 - A normal breath has a volume of about 1L. The...Ch. 3 - An automobile tire contains 15.6L of air at...Ch. 3 - An automobile tire contains 15.6L of air at...Ch. 3 - A sample of ideal gas from a compressed gas...Ch. 3 - Prob. 3.29ECh. 3 - In Example 3.5, a heat capacity of 20.78J/molK was...Ch. 3 - Prob. 3.31ECh. 3 - 4.00L of Ar and 2.50L of He, each at 298K and...Ch. 3 - Dentists might use a mixture of 40N2O and 60O2 as...Ch. 3 - A 5.33-g piece of Cu metal is heated to 99.7C in...Ch. 3 - A sample of 1.00mol of silver at 150C is placed in...Ch. 3 - Prob. 3.36ECh. 3 - What is the change in entropy when 2.22mol of...Ch. 3 - Estimate the entropy change of an 800-lb engine...Ch. 3 - Calculate the molar entropy change of the gas that...Ch. 3 - A normal breath is about 1L in volume. Assume you...Ch. 3 - The first law of thermodynamics is sometimes...Ch. 3 - Troutons rule states that the entropy of boiling...Ch. 3 - Prob. 3.43ECh. 3 - Argue from Boltzmanns definition for entropy that...Ch. 3 - Prob. 3.45ECh. 3 - Which system has the higher entropy? a A clean...Ch. 3 - Which system has the higher entropy? a 1g of solid...Ch. 3 - The absolute entropy of He at 298.15K is...Ch. 3 - The absolute entropy of Kr at 298.15K is...Ch. 3 - The element helium is thought to remain a liquid...Ch. 3 - Order the following substances in order of...Ch. 3 - The molar entropy change for a process is...Ch. 3 - What is the entropy change of a process if ...Ch. 3 - One mole of ideal gas expands isothermally and...Ch. 3 - Why isnt the entropy of elements in their standard...Ch. 3 - Determine the entropy of formation, fS, of the...Ch. 3 - The thermite reaction has solid aluminum powder...Ch. 3 - Prob. 3.58ECh. 3 - Determine the differences in the rxnS under...Ch. 3 - Calcium carbonate has two crystalline forms,...Ch. 3 - The chemical formula for gasoline can be...Ch. 3 - Prob. 3.62ECh. 3 - Prob. 3.63ECh. 3 - Plants take in CO2(g) and H2O(l) and make glucose,...Ch. 3 - Prob. 3.65ECh. 3 - Prob. 3.66ECh. 3 - Plots of Cp/T versus T are used to determine the...
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