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Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Question 5

Transcribed Image Text:The average kinetic energy of the molecules in a gas sample depends only on the temperature, T. However, given the same
kinetic energies, a lighter molecule will move faster than a heavier molecule, as shown in the equation for rms speed
3RT
rms speed
V M
where R
8.314 J/(mol·K) and M is molar mass in kilograms per mole. Note that a joule is the same as a kilogram-meter
squared per second squared (kg-m²/s²).
What is the rms speed of F, molecules at 305 K?
rms speed:
m/s
What is the rms speed of He atoms at 305 K?
rms speed:
m/s
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