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Edit View History Bookmarks People Window Help 783 Sun Mar 26 5:12:27 PM a MasteringPhysics: Ch 12 HW Secure https://session.masteringphysics.com/myct/itemView?assignmentProblemID 73337571&offset-prev; PHY143 W17 College Physics Tarini Signed in as lsaiah Alexander Ch 12 HW Problem 12.16 Enhanced with Feedback previous l 7 of 10 l next Problem 12.16 Enhanced with Feedback Part A Mars has an atmosphere composed almost entirely What is the rms speed of a molecule in Mars's atmosphere? Assume R *8.315 J/mol. K. of carbon dioxide, with an average temperature of -63 C Express your answer to two significant figures and include the appropriate units. You may want to review (apages 360-366). Value Units Submit My Answers Give Up Feedback Continue Daniel W BA/MD program NJL...

Explanation / Answer

Rms Speed of molecule = sqrt 3KT/m

K = Boltzmann's costant = 1.38*10^-23 joule/K

T = 273 - 63 = 210 K;
m = 44 * 1.672*10^-27 Kg;

1.672*10^-27 Kg is the weight of a single a.m.u. (atomic mass unit);

Molecular weight of CO2 = 44 amu

Molecular Speed (CO2) = sqrt 3*1.38*10^-23*210/44*1.672*10^-27 = 344 m/sec.

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