Chemistry & Chemical Reactivity
10th Edition
ISBN: 9781337399074
Author: John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher: Cengage Learning
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Textbook Question
Chapter 19, Problem 112SCQ
The free energy change for a reaction, ΔrG°, is the maximum energy that can be extracted from the process as work, whereas ΔrH° is the total chemical potential energy change. The efficiency of a fuel cell is the ratio of these two quantities.
Efficiency = ΔrG°ΔrH°×100%
Consider the hydrogen-oxygen fuel cell, where the net reaction is
H2(g) + 12 O2(g)→ H2O(l)
- (a) Calculate the efficiency of the fuel cell under standard conditions.
- (b) Calculate the efficiency of the fuel cell if the product is water vapor instead of liquid water.
- (c) Does the efficiency depend on the state of the reaction product? Why or why not?
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Chapter 19 Solutions
Chemistry & Chemical Reactivity
Ch. 19.1 - A common laboratory analysis for iron is to...Ch. 19.1 - Prob. 19.2CYUCh. 19.2 - Describe how to set up a voltaic cell using the...Ch. 19.2 - The following overall chemical reaction occurs in...Ch. 19.4 - (a) Rank the following metals in their ability to...Ch. 19.5 - A voltaic cell is set up with an aluminum...Ch. 19.5 - The half-cells Ag+(aq. 1.0 M)|Ag(s) and H+(aq, ?...Ch. 19.6 - Prob. 19.8CYUCh. 19.6 - Calculate the equilibrium constant at 25 C for the...Ch. 19.7 - Predict the chemical reactions that will occur at...
Ch. 19.8 - Prob. 19.11CYUCh. 19.9 - Prob. 1.1ACPCh. 19.9 - Prob. 1.2ACPCh. 19.9 - Prob. 1.3ACPCh. 19.9 - Prob. 2.1ACPCh. 19.9 - Use standard reduction potentials to determine...Ch. 19.9 - Prob. 2.3ACPCh. 19.9 - The overall reaction for the production of Cu(OH)2...Ch. 19.9 - Assume the following electrochemical cell...Ch. 19 - Write balanced equations for the following...Ch. 19 - Write balanced equations for the following...Ch. 19 - Balance the following redox equations. All occur...Ch. 19 - Balance the following redox equations. All occur...Ch. 19 - Balance the following redox equations. All occur...Ch. 19 - Prob. 6PSCh. 19 - A voltaic cell is constructed using the reaction...Ch. 19 - A voltaic cell is constructed using the reaction...Ch. 19 - The half-cells Fe2+(aq) | Fe(s) and O2(g) | H2O...Ch. 19 - The half cells Sn2+(aq) |Sn(s) and Cl2(g) |Cl(aq)...Ch. 19 - For each of the following electrochemical cells,...Ch. 19 - For each of the following electrochemical cells,...Ch. 19 - Use cell notation to depict an electrochemical...Ch. 19 - Use cell notation to depict an electrochemical...Ch. 19 - What are the similarities and differences between...Ch. 19 - What reactions occur when a lead storage battery...Ch. 19 - Calculate the value of E for each of the following...Ch. 19 - Calculate the value of E for each of the following...Ch. 19 - Balance each of the following unbalanced...Ch. 19 - Balance each of the following unbalanced...Ch. 19 - Consider the following half-reactions: (a) Based...Ch. 19 - Prob. 22PSCh. 19 - Which of the following elements is the best...Ch. 19 - Prob. 24PSCh. 19 - Which of the following ions is most easily...Ch. 19 - From the following list, identify the ions that...Ch. 19 - (a) Which halogen is most easily reduced in acidic...Ch. 19 - Prob. 28PSCh. 19 - Calculate the potential delivered by a voltaic...Ch. 19 - Calculate the potential developed by a voltaic...Ch. 19 - One half-cell in a voltaic cell is constructed...Ch. 19 - One half-cell in a voltaic cell is constructed...Ch. 19 - One half-cell in a voltaic cell is constructed...Ch. 19 - One half-cell in a voltaic cell is constructed...Ch. 19 - Calculate rG and the equilibrium constant for the...Ch. 19 - Prob. 36PSCh. 19 - Use standard reduction potentials (Appendix M) for...Ch. 19 - Use the standard reduction potentials (Appendix M)...Ch. 19 - Use the standard reduction potentials (Appendix M)...Ch. 19 - Use the standard reduction potentials (Appendix M)...Ch. 19 - Prob. 41PSCh. 19 - Prob. 42PSCh. 19 - Which product, O2 or F2, is more likely to form at...Ch. 19 - Which product, Ca or H2, is more likely to form at...Ch. 19 - An aqueous solution of KBr is placed in a beaker...Ch. 19 - An aqueous solution of Na2S is placed in a beaker...Ch. 19 - In the electrolysis of a solution containing...Ch. 19 - In the electrolysis of a solution containing...Ch. 19 - Electrolysis of a solution of CuSO4(aq) to give...Ch. 19 - Electrolysis of a solution of Zn(NO3)2(aq) to give...Ch. 19 - A voltaic cell can be built using the reaction...Ch. 19 - Assume the specifications of a Ni-Cd voltaic cell...Ch. 19 - Use E values to predict which of the following...Ch. 19 - Prob. 54PSCh. 19 - Prob. 55PSCh. 19 - Prob. 56PSCh. 19 - Prob. 57GQCh. 19 - Balance the following equations. (a) Zn(s) +...Ch. 19 - Magnesium metal is oxidized, and silver ions are...Ch. 19 - You want to set up a series of voltaic cells with...Ch. 19 - Prob. 61GQCh. 19 - Prob. 62GQCh. 19 - In the table of standard reduction potentials,...Ch. 19 - Prob. 64GQCh. 19 - Four voltaic cells are set up. In each, one...Ch. 19 - The following half-cells are available: (i)...Ch. 19 - Prob. 67GQCh. 19 - Prob. 68GQCh. 19 - A potential of 0.142 V is recorded (under standard...Ch. 19 - Prob. 70GQCh. 19 - The standard potential, E, for the reaction of...Ch. 19 - An electrolysis cell for aluminum production...Ch. 19 - Electrolysis of molten NaCl is done in cells...Ch. 19 - A current of 0.0100 A is passed through a solution...Ch. 19 - A current of 0.44 A is passed through a solution...Ch. 19 - Prob. 76GQCh. 19 - Prob. 77GQCh. 19 - Prob. 78GQCh. 19 - The products formed in the electrolysis of aqueous...Ch. 19 - Predict the products formed in the electrolysis of...Ch. 19 - Prob. 81GQCh. 19 - The metallurgy of aluminum involves electrolysis...Ch. 19 - Prob. 83GQCh. 19 - Prob. 84GQCh. 19 - Prob. 85GQCh. 19 - Prob. 86GQCh. 19 - Two Ag+(aq) | Ag(s) half-cells are constructed....Ch. 19 - Calculate equilibrium constants for the following...Ch. 19 - Prob. 89GQCh. 19 - Use the table of standard reduction potentials...Ch. 19 - Prob. 91GQCh. 19 - Prob. 92GQCh. 19 - Prob. 93GQCh. 19 - A voltaic cell is constructed in which one...Ch. 19 - An expensive but lighter alternative to the lead...Ch. 19 - The specifications for a lead storage battery...Ch. 19 - Manganese may play an important role in chemical...Ch. 19 - Prob. 98GQCh. 19 - Iron(II) ion undergoes a disproportionation...Ch. 19 - Copper(I) ion disproportionates to copper metal...Ch. 19 - Prob. 101GQCh. 19 - Prob. 102GQCh. 19 - Can either sodium or potassium metal be used as a...Ch. 19 - Galvanized steel pipes are used in the plumbing of...Ch. 19 - Consider an electrochemical cell based on the...Ch. 19 - Prob. 106ILCh. 19 - A silver coulometer (Study Question 106) was used...Ch. 19 - Four metals, A, B, C, and D, exhibit the following...Ch. 19 - Prob. 109ILCh. 19 - The amount of oxygen, O2, dissolved in a water...Ch. 19 - Prob. 111SCQCh. 19 - The free energy change for a reaction, rG, is the...Ch. 19 - Prob. 113SCQCh. 19 - (a) Is it easier to reduce water in acid or base?...Ch. 19 - Prob. 115SCQ
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