Molecular Speeds: The rms speed of a certain sample of carbon dioxide molecules, with a molecular weight of 44.0 g/mole, is 396 m/s. What is the rms speed of water vapor molecules, with a molecular weight of 18.0 g/mol, at the same temperature as the carbon dioxide?
A. 253 m/s
B. 387 m/s
C. 421 m/s
D. 506 m/s
E. 619 m/s
Answer: E
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