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13. [0/1 Points] + DETAILS Additional Materials Reading 14. [0/2 Points] DETAILS The escape velocity from Mars is much smaller than from Earth and is only 5.03 km/s. At what temperature (in K) would hydrogen molecules (molar mass is equal to 2.016 g/mol) have an average velocity Vrms equal to Mars's escape velocity? 2408 X K PREVIOUS ANSWERS = 764 OSCOLPHYS2016 13.4.P.043. PREVIOUS ANSWERS MY NOTES Additional Materials OSCOLPHYS2016 13.4.WA.047. MY NOTES ASK YOUR TEACHER (b) At what temperature would their average speeds differ by 1.35 m/s? 1608.77 ASK YOUR TEACHER 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 speeds Vrms of uranium hexafluoride gas, UF6. (Use k = 1.38 x 10" J/K for this question.) -23 PRACTICE ANOTHER (a) The molecular masses for 235UF6 and 238µF are 349.0 g/mol and 352.0 g/mol, respectively. What is the ratio of their average speeds? (Enter your answer to at least 4 decimal places.) V235 V238 X What is the difference in the two rms speeds in terms of the answer you got in part (a)? K PRACTICE ANOTHER