A mixture of two monatomic gases is confined in a container. Gas A has an atomic

Question

A mixture of two monatomic gases is confined in a container. Gas A has an atomic mass that is four times the atomic mass of gas B. For the next two questions, select the correct units from the following list.

The ratio of the RMS speeds of gas A to gas B (vA/vB) is _____.
The ratio of the average molecular kinetic energies of gas B to gas A (KB/KA) is _____.

I got 2 for the RMS speeds--is this right? What about the second part?

A 2 B 1/16 C 16 D 1/8 E 1 F 1/4 G 8 H 4 I 1/2 J The correct response is not shown above.

Explanation / Answer

As rms speed varies inversely with the square root of the molar mass, then

vA/vB = 1/2 [ANSWER, PART A]

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As the temperature is the same, KE are the same. Thus,

KB/KA = 1 [answer, part b]

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