Chemistry Atoms First2e
2nd Edition
ISBN: 9781947172647
Author: OpenStax
Publisher: OpenStax College
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Textbook Question
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Chapter 6, Problem 45E
What mass of a 4.00% NaOH solution by mass contains 15.0 g of NaOH?
Expert Solution & Answer
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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 6 Solutions
Chemistry Atoms First2e
Ch. 6 - What is the total mass (amu) of carbon in each of...Ch. 6 - What is the total mass of hydrogen in each of the...Ch. 6 - Calculate the molecular or formula mass of each of...Ch. 6 - Determine the molecular mass of the following...Ch. 6 - Determine the molecular mass of the following...Ch. 6 - Which molecule has a molecular mass of 28.05 amu?Ch. 6 - What information do we need to determine the...Ch. 6 - Calculate the following to four significant...Ch. 6 - Determine the following to four significant...Ch. 6 - Determine the percent ammonia, NH3, in Co(...
Ch. 6 - Determine the percent water in CuSO45H2O to three...Ch. 6 - Determine the empirical formulas for compounds...Ch. 6 - Determine the empirical formulas for compounds...Ch. 6 - A compound of carbon and hydrogen contains 92.3% C...Ch. 6 - Dichioroethane, a compound that is often used for...Ch. 6 - Determine the empirical and molecular formula for...Ch. 6 - Polymers are large molecules composed of simple...Ch. 6 - A major textile dye manufacturer developed a new...Ch. 6 - Explain what changes and what stays the same when...Ch. 6 - What information do we need to calculate the...Ch. 6 - A 200-mL sample and a 400-mL sample of a solution...Ch. 6 - Determine the molarity for each of the following...Ch. 6 - Determine the molarity of each of the following...Ch. 6 - Consider this question: What is the mass of the...Ch. 6 - Consider this question: What is the mass of solute...Ch. 6 - Calculate the number of moles and the mass of the...Ch. 6 - Calculate the number of moles and the mass of the...Ch. 6 - Consider this question: What is the molarity of...Ch. 6 - Consider this question: What is the molarity of...Ch. 6 - Calculate the molarity of each of the following...Ch. 6 - Calculate the molarity of each of the following...Ch. 6 - There is about 1.0 g of calcium, as Ca2+, in LO L...Ch. 6 - What volume of a 1.00MFe( NO3)3 solution can be...Ch. 6 - If 0.1718 L of a 0.3556-M C3H7OH solution is...Ch. 6 - If 4.12 L of a 0.850 MH3PO4 solution is be diluted...Ch. 6 - What volume of a 0.33MC12H22O11 solution can be...Ch. 6 - What is the concentration of the NaCl solution...Ch. 6 - What is the molarity of the diluted solution when...Ch. 6 - What is the final concentration of the solution...Ch. 6 - A 2.00-L bottle of a solution of concentrated HCl...Ch. 6 - An experiment in a general chemistry laboratory...Ch. 6 - What volume of a 0.20MK2SO4 solution contains 57 g...Ch. 6 - The US Environmental Protection Agency (EPA)...Ch. 6 - Consider this question: What mass of a...Ch. 6 - What mass of a 4.00% NaOH solution by mass...Ch. 6 - What mass of solid NaOH (97.0% NaOH by mass) is...Ch. 6 - What mass of HCl is contained in 45.0 mL of an...Ch. 6 - The hardness of water (hardness count) is usually...Ch. 6 - The hardness of water (hardness count) is usually...Ch. 6 - In Canada and the United Kingdom, devices that...Ch. 6 - A throat spray is 1.40% by mass phenol, C6H5OH, in...Ch. 6 - Copper(I) iodide (CuI) is often added to table...Ch. 6 - A cough syrup contains 5.0% ethyl alcohol, C2H5OH,...Ch. 6 - D5W is a solution used as an intravenous fluid. It...Ch. 6 - Find the molarity of a 40.0% by mass aqueous...
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