Chemistry with Access Code, Hybrid Edition
9th Edition
ISBN: 9781285188492
Author: Steven S. Zumdahl
Publisher: CENGAGE L
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Chapter 18, Problem 81E
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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
system:
rise
Under these conditions, will the pressure of NH 3 tend to rise or fall?
☐ x10
fall
Х
Is it possible to reverse this tendency by adding H₂?
In other words, if you said the pressure of NH 3 will tend to rise, can that
be changed to a tendency to fall by adding H₂? Similarly, if you said the
pressure of NH3 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.
yes
no
atm
00.
18
Ar
무ㅎ
?
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
formulas of the species that will act as neither acids nor bases in the 'other' row.
You will find it useful to keep in mind that HF is a weak acid.
2.2 mol of NaOH is added to
1.0 L of a 1.4M HF
solution.
acids:
П
bases:
Х
other: ☐
ப
acids:
0.51 mol of KOH is added to
1.0 L of a solution that is
bases:
1.3M in both HF and NaF.
other: ☐
00.
18
Ar
Using reaction free energy to predict equilibrium composition
Consider the following equilibrium:
N2O4 (g) 2NO2 (g)
AG⁰ = 5.4 kJ
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?
x10
fall
Is it possible to reverse this tendency by adding NO2?
In other words, if you said the pressure of N2O4 will tend to rise, can that
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?
If you said the tendency can be reversed in the second question, calculate
the minimum pressure of NO 2 needed to reverse it.
Round your answer to 2 significant digits.
yes
no
0.42 atm
☑
5
0/5
?
مله
Ar
Chapter 18 Solutions
Chemistry with Access Code, Hybrid Edition
Ch. 18 - What is a half-reaction? Why must the number of...Ch. 18 - Galvanic cells harness spontaneous...Ch. 18 - Table 17-1 lists common half-reactions along with...Ch. 18 - Consider the equation G = -nF. What are the four...Ch. 18 - The Nernst equation allows determination of the...Ch. 18 - What are concentration cells? What is in a...Ch. 18 - Prob. 7RQCh. 18 - Prob. 8RQCh. 18 - What characterizes an electrolytic cell? What is...Ch. 18 - Sketch a galvanic cell, and explain how it works....
Ch. 18 - In making a specific galvanic cell, explain how...Ch. 18 - Prob. 3ALQCh. 18 - Prob. 4ALQCh. 18 - Sketch a cell that forms iron metal from iron(II)...Ch. 18 - Which of the following is the best reducing agent:...Ch. 18 - You are told that metal A is a better reducing...Ch. 18 - Explain the following relationships: G and w, cell...Ch. 18 - Explain why cell potentials are not multiplied by...Ch. 18 - What is the difference between and ? When is equal...Ch. 18 - Consider the following galvanic cell: What happens...Ch. 18 - Look up the reduction potential for Fe3+ to Fe2+....Ch. 18 - If the cell potential is proportional to work and...Ch. 18 - Is the following statement true or false?...Ch. 18 - Define oxidation and reduction in terms of both...Ch. 18 - Assign oxidation numbers to all the atoms in each...Ch. 18 - Specify which of the following equations represent...Ch. 18 - The Ostwald process for the commercial production...Ch. 18 - What is electrochemistry? What are redox...Ch. 18 - When balancing equations in Chapter 3, we did not...Ch. 18 - When magnesium metal is added to a beaker of...Ch. 18 - How can one construct a galvanic cell from two...Ch. 18 - The free energy change for a reaction, G, is an...Ch. 18 - What is wrong with the following statement: The...Ch. 18 - When jump-starting a car with a dead battery, the...Ch. 18 - In theory, most metals should easily corrode in...Ch. 18 - Consider the electrolysis of a molten salt of some...Ch. 18 - Consider the following electrochemical cell: a. If...Ch. 18 - Prob. 29ECh. 18 - Prob. 30ECh. 18 - Balance the following oxidationreduction reactions...Ch. 18 - Balance the following oxidationreduction reactions...Ch. 18 - Chlorine gas was first prepared in 1774 by C. W....Ch. 18 - Prob. 34ECh. 18 - Consider the following galvanic cell: Label the...Ch. 18 - Consider the following galvanic cell: a. Label the...Ch. 18 - Sketch the galvanic cells based on the following...Ch. 18 - Sketch the galvanic cells based on the following...Ch. 18 - Calculate values for the galvanic cells in...Ch. 18 - Calculate values for the galvanic cells in...Ch. 18 - Sketch the galvanic cells based on the following...Ch. 18 - Sketch the galvanic cells based on the following...Ch. 18 - Give the standard line notation for each cell in...Ch. 18 - Give the standard line notation for each cell in...Ch. 18 - Consider the following galvanic cells: For each...Ch. 18 - Give the balanced cell equation and determine for...Ch. 18 - Calculate values for the following g cells. Which...Ch. 18 - Calculate values for the following cells. Which...Ch. 18 - Chlorine dioxide (C1O2), which is produced by the...Ch. 18 - The amount of manganese in steel is determined by...Ch. 18 - Calculate the maximum amount of work that can be...Ch. 18 - Calculate the maximum amount of work that can be...Ch. 18 - Estimate for the half-reaction 2H2O+2eH2+2OH given...Ch. 18 - The equation G = nF also can be applied to...Ch. 18 - Glucose is the major fuel for most living cells....Ch. 18 - Direct methanol fuel cells (DMFCs) have shown some...Ch. 18 - Using data from Table 18.1, place the following in...Ch. 18 - Using data from Table 18.1, place the following in...Ch. 18 - Answer the following questions using data from...Ch. 18 - Answer the following questions using data from...Ch. 18 - Consider only the species (at standard conditions)...Ch. 18 - Prob. 62ECh. 18 - Use the table of standard reduction potentials...Ch. 18 - Use the table of standard reduction potentials...Ch. 18 - Prob. 65ECh. 18 - Prob. 66ECh. 18 - Consider the concentration cell in Fig. 17-10. If...Ch. 18 - Consider the concentration cell shown below....Ch. 18 - Consider a concentration cell similar to the one...Ch. 18 - The overall reaction in the lead storage battery...Ch. 18 - Calculate the pH of the cathode compartment for...Ch. 18 - Consider the cell described below:...Ch. 18 - Consider the cell described below:...Ch. 18 - Calculate G and K at 25C for the reactions in...Ch. 18 - Calculate G and K at 25C for the reactions in...Ch. 18 - Consider the galvanic cell based on the following...Ch. 18 - Consider the galvanic cell based on the following...Ch. 18 - An electrochemical cell consists of a standard...Ch. 18 - Prob. 80ECh. 18 - An electrochemical cell consists of a standard...Ch. 18 - An electrochemical cell consists of a nickel metal...Ch. 18 - Consider a concentration cell that has both...Ch. 18 - You have a concentration cell in which the cathode...Ch. 18 - Under standard conditions, what reaction occurs,...Ch. 18 - A disproportionation reaction involves a substance...Ch. 18 - Consider the following galvanic cell at 25C:...Ch. 18 - An electrochemical cell consists of a silver metal...Ch. 18 - Prob. 89ECh. 18 - For the following half-reaction, = 2.07 V:...Ch. 18 - Calculate for the following half-reaction:...Ch. 18 - The solubility product for CuI(s) is 1.1 102...Ch. 18 - How long will it take to plate out each of the...Ch. 18 - The electrolysis of BiO+ produces pure bismuth....Ch. 18 - What mass of each of the following substances can...Ch. 18 - Aluminum is produced commercially by the...Ch. 18 - An unknown metal M is electrolyzed. It took 74.1 s...Ch. 18 - Prob. 98ECh. 18 - What volume of F2 gas, at 25C and 1.00 atm, is...Ch. 18 - What volumes of H2(g) and O2(g) at STP are...Ch. 18 - A single HallHeroult cell (as shown in Fig. 17-22)...Ch. 18 - A factory wants to produce 1.00 103 kg barium...Ch. 18 - It took 2.30 min using a current of 2.00 A to...Ch. 18 - A solution containing Pt4+ is electrolyzed with a...Ch. 18 - A solution at 25C contains 1.0 M Cd2+, 1.0 M Ag+,...Ch. 18 - Prob. 106ECh. 18 - In the electrolysis of an aqueous solution of...Ch. 18 - Copper can be plated onto a spoon by placing the...Ch. 18 - Prob. 109ECh. 18 - Prob. 110ECh. 18 - What reactions take place at the cathode and the...Ch. 18 - What reaction will take place at the Cathode and...Ch. 18 - Gold is produced electrochemically from an aqueous...Ch. 18 - The blood alcohol (C2H5OH) level can be determined...Ch. 18 - The saturated calomel electrode. abbreviated SCE....Ch. 18 - Consider the following half-reactions: Explain why...Ch. 18 - Consider the standard galvanic cell based on the...Ch. 18 - A standard galvanic cell is constructed so that...Ch. 18 - The black silver sulfide discoloration of...Ch. 18 - Prob. 120AECh. 18 - When aluminum foil is placed in hydrochloric acid,...Ch. 18 - Prob. 122AECh. 18 - A fuel cell designed to react grain alcohol with...Ch. 18 - The overall reaction and equilibrium constant...Ch. 18 - Prob. 125AECh. 18 - The overall reaction and standard cell potential...Ch. 18 - Prob. 127AECh. 18 - The ultimate electron acceptor in the respiration...Ch. 18 - One of the few industrial-scale processes that...Ch. 18 - It took 150. s for a current of 1.25 A to plate...Ch. 18 - Prob. 131AECh. 18 - In the electrolysis of a sodium chloride solution,...Ch. 18 - An aqueous solution of an unknown salt of...Ch. 18 - Which of the following statement(s) is/are true?...Ch. 18 - Consider a galvanic cell based on the following...Ch. 18 - Prob. 136CWPCh. 18 - Consider a galvanic cell based on the following...Ch. 18 - An electrochemical cell consists of a silver metal...Ch. 18 - An aqueous solution of PdCl2 is electrolyzed for...Ch. 18 - Prob. 140CPCh. 18 - Prob. 141CPCh. 18 - The overall reaction in the lead storage battery...Ch. 18 - Consider the following galvanic cell: Calculate...Ch. 18 - A zinc-copper battery is constructed at follows at...Ch. 18 - A galvanic cell is based on the following...Ch. 18 - Consider a cell based on the following...Ch. 18 - Prob. 147CPCh. 18 - You have a concentration cell with Cu electrodes...Ch. 18 - A galvanic cell is based on the following...Ch. 18 - Given the following two standard reduction...Ch. 18 - Consider the following galvanic cell: Calculate...Ch. 18 - Prob. 152CPCh. 18 - Consider the following galvanic cell: A 15 0-mole...Ch. 18 - When copper reacts with nitric acid, a mixture of...Ch. 18 - The following standard reduction potentials have...Ch. 18 - An electrochemical cell is set up using the...Ch. 18 - Three electrochemical cells were connected in...Ch. 18 - A silver concentration cell is set up at 25C as...Ch. 18 - A galvanic cell is based on the following...Ch. 18 - The table below lists the cell potentials for the...
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