Chemistry and Chemical Reactivity (9th Edition)

Published by Cengage Learning
ISBN 10: 1133949649
ISBN 13: 978-1-13394-964-0

Chapter 10 Gases and Their Properties - Study Questions - Page 403c: 42


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Ar has a greater molecular weight than $N_2$ so at the same mass, $N_2$ has a bigger number of moles, and since T and V are the same, $N_2$ is in a flask with greater pressure ($P\propto n$). Since $\sqrt{\bar{u^2}}=\sqrt{3RT/M}$, and the temperatures are the same, $N_2$ will have a bigger rms speed because it has a lower molecular weight. a) True b) False c) False d) True, number of collisions with the walls is measured by the pressure.
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