Chemistry Atoms First2e
2nd Edition
ISBN: 9781947172647
Author: OpenStax
Publisher: OpenStax College
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Textbook Question
Chapter 8, Problem 81E
A balloon filled with helium gas takes 6 hours to deflate to 50% of its original volume. How long will it take for an identical balloon filled with the same volume of hydrogen gas (instead of helium) to decrease its volume by 50%?
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111
States of Matter
Understanding conceptual components of the enthalpy of solution
0/5
Ge
A small amount of acetonitrile (CH, CN) is dissolved in a large amount of water. Imagine separating this process into the four stages sketched below. (These
sketches show only a portion of the substances, so you can see the density and distribution of atoms and molecules in them.)
CH,CN
H₂O
B
88
C
Use these sketches to answer the questions in the table below.
The enthalpy of solution AH is negative
soln
when CH3CN dissolves in water. Use this
information to list the stages in order of increasing
enthalpy.
Would heat be absorbed or released if the system
moved from Stage C to D?
What force would oppose or favor the system
moving from Stage C to D? Check all that apply.
1
absorbed
O released
neither absorbed nor released.
none
O ionic bonding force
covalent bonding force…
In a system with an anodic overpotential, the variation of ŋ as a function of
the current density:
1. at low fields is linear 2. at higher fields, it follows Tafel's law
Find the range of current densities for which the overpotential has the same
value as when calculated for cases 1 and 2 (maximum relative difference of
5% with respect to the behavior for higher fields). To which overpotential
range does this correspond?
Data: 10 = 1.5 mA cm², T = 300°C, ẞ = 0.64, R = 8.314 J K 1 mol¹ and F = 96485
C mol-1.
Indicate 10.6 with only one significant figure.
Chapter 8 Solutions
Chemistry Atoms First2e
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A balloon filled with helium gas takes 6 hours to...Ch. 8 - Explain why the numbers of molecules are not...Ch. 8 - Starting with the definition of rate of effusion...Ch. 8 - Heavy water, D2O (molar mass = 20.03 g mol-1). can...Ch. 8 - Which of the following gases diffuse more slowly...Ch. 8 - During the discussion of gaseous diffusion for...Ch. 8 - Calculate the relative rate of diffusion of...Ch. 8 - A gas of unknown identity diffuses at a rate of...Ch. 8 - When two cotton plugs. one moistened with ammonia...Ch. 8 - Using the postulates of the kinetic molecular...Ch. 8 - Can the speed of a given molecule in a gas double...Ch. 8 - Describe what happens o the average kinetic energy...Ch. 8 - The distribution of molecular velocities in a...Ch. 8 - What is the ratio of the average kinetic energy of...Ch. 8 - A 1-L sample of CO initially at STP is heated to...Ch. 8 - The root mean square speed of H2, molecules at 25...Ch. 8 - Answer the following questions: (a) Is the...Ch. 8 - Show that the ratio of the rate of diffusion of...Ch. 8 - 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