There are two important isotopes of uranium— 235U and 238U ; these isotopes are nearly identical chemically but have different atomic masses. Only 235U is very useful in nuclear reactors. One of the techniques for separating them (gas diffusion) is based on the different average velocitiesvrms of uranium hexafluoride gas, UF6 .                                                        (a) The molecular masses for 235U UF6 and 238U UF6 are 349.0 g/moland 352.0 g/mol, respectively. What is the ratio of their average velocities? (b) At what temperature would their average velocities differ by 1.00 m/s? (c) Do your answers in this problem imply that this technique may be difficult?

Principles of Physics: A Calculus-Based Text
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ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
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Chapter16: Temperature And The Kinetic Theory Of Gases
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There are two important isotopes of uranium— 235U and 238U ; these isotopes are nearly identical chemically but have different atomic masses. Only 235U is very useful in nuclear reactors. One of the techniques for separating them (gas diffusion) is based on the different average velocities
vrms of uranium hexafluoride gas, UF6 .                                                        (a) The molecular masses for 235U UF6 and 238U UF6 are 349.0 g/mol
and 352.0 g/mol, respectively. What is the ratio of their average velocities? (b) At what temperature would their average velocities differ by 1.00 m/s? (c) Do your answers in this problem imply that this technique may be difficult?

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