Principles of Modern Chemistry
8th Edition
ISBN: 9781305079113
Author: David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher: Cengage Learning
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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
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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
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 4 Solutions
Principles of Modern Chemistry
Ch. 4 - Some water waves reach the beach at a rate of one...Ch. 4 - The spacing between bands of color in a chemical...Ch. 4 - An FM radio station broadcasts at a frequency of...Ch. 4 - The gamma rays emitted by 60Co are used in...Ch. 4 - Radio waves of wavelength 6.00102m can be used to...Ch. 4 - An argon ion laser emits light of wavelength of...Ch. 4 - The speed of sound in dry air at 20°C is 343.5ms1...Ch. 4 - Ultrasonic waves have frequencies too high to be...Ch. 4 - The maximum in the blackbody radiation intensity...Ch. 4 - Use the data in Figure 4.8 to estimate the ratio...
Ch. 4 - Excited lithium atoms emit light strongly at a...Ch. 4 - Excited mercury atoms emit light strongly at a...Ch. 4 - Barium atoms in a flame emit light as they undergo...Ch. 4 - Potassium atoms in a flame emit light as they...Ch. 4 - The sodium D-line is actually a pair of closely...Ch. 4 - The power output of a laser is measured by its...Ch. 4 - In a FranckHertz experiment on sodium atoms, the...Ch. 4 - In a FranckHertz experiment on hydrogen atoms, the...Ch. 4 - Use the Bohr model to calculate the radius and the...Ch. 4 - He+ ions are observed in stellar atmospheres. Use...Ch. 4 - The radiation emitted in the transition from n=3...Ch. 4 - Prob. 22PCh. 4 - Prob. 23PCh. 4 - When an intense beam of green light is directed...Ch. 4 - Cesium frequently is used in photocells because...Ch. 4 - Alarm systems use the photoelectric effect. A beam...Ch. 4 - Light with a wavelength of 2.50107m falls on the...Ch. 4 - Calculate the maximum wavelength of...Ch. 4 - Prob. 29PCh. 4 - Prob. 30PCh. 4 - Calculate the de Broglie wavelength of the...Ch. 4 - Calculate the de Broglie wavelength of the...Ch. 4 - Prob. 33PCh. 4 - Prob. 34PCh. 4 - (a) The position of an electron is known to be...Ch. 4 - No object can travel faster than the speed of...Ch. 4 - (a) Using Equation 4.36, make a graph of the n=3...Ch. 4 - Using a simple particle-in-a-box model for the...Ch. 4 - Chapter 3 introduced the concept of a double bond...Ch. 4 - When metallic sodium is dissolved in liquid sodium...Ch. 4 - Prob. 41PCh. 4 - Prob. 42PCh. 4 - Prob. 43PCh. 4 - Prob. 44PCh. 4 - A piano tuner uses a tuning fork that emits sound...Ch. 4 - The distant galaxy called Cygnus A is one of the...Ch. 4 - Hot objects can emit blackbody radiation that...Ch. 4 - Compare the energy (in joules) carried by an X-ray...Ch. 4 - The maximum in Planck’s formula for the emission...Ch. 4 - Prob. 50APCh. 4 - When ultraviolet light of wavelength 131 nm...Ch. 4 - Express the speed of the electron in the Bohr...Ch. 4 - Photons are emitted in the Lyman series as...Ch. 4 - Prob. 54APCh. 4 - The energies of macroscopic objects, as well as...Ch. 4 - Prob. 56APCh. 4 - Prob. 57APCh. 4 - It has been suggested that spacecraft could be...Ch. 4 - Prob. 59APCh. 4 - The normalized wave function for a particle in a...Ch. 4 - A particle of mass m is placed in a...
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