Chapter 20: Q. 15 (page 567)
What are the speeds of (a)argon atoms and (b) hydrogen molecules at ?
Short Answer
(A) For argon .
(B) For hydrogen.
Chapter 20: Q. 15 (page 567)
What are the speeds of (a)argon atoms and (b) hydrogen molecules at ?
(A) For argon .
(B) For hydrogen.
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Get started for freeAn experiment you're designing needs a gas with . You recall from your physics class that no individual gas has this value, but it occurs to you that you could produce a gas with by mixing together a monatomic gas and a diatomic gas. What fraction of the molecules need to be monatomic?
The density of air at STP is about the density of water. How does the average distance between air molecules compare to the average distance between water molecules? Explain.
FIGURE EX20.10 is a histogram showing the speeds of the molecules in a very small gas. What are
(a) the most probable speed,
(b) the average speed, and
(c) the rms speed?
The two containers of gas in FIGURE Q20.8 are in good thermal contact with each other but well insulated from the environment. They have been in contact for a long time and are in thermal equilibrium.
a. Is of helium greater than, less than, or equal to of argon? Explain.
b. Does the helium have more thermal energy, less thermal energy, or the same amount of thermal energy as the argon? Explain.
6. Suppose you could suddenly increase the speed of every molecule in a gas by a factor of 2.
a. Would the RMS speed of the molecules increase by a factor of ? Explain.
b. Would the gas pressure increase by a factor of or ? Explain.
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