Air, Which Is Primarily Nitrogen and Oxygen, Does Contain a Very

question 140

Multiple Choice

Air, which is primarily nitrogen and oxygen, does contain a very small fraction of helium.What is the root-mean-square speed of helium at 25 $\degree$ C, where its average kinetic energy is about 3.72 kJ/mol? How many times faster or slower does it travel than N₂? (1 J =1 kg .m²/s²; 1 mol =6.02 *10²³)

• A)1360 m/s; 2.65 times faster
• B)515 m/s; 0.378 times slower
• C)1860 km/s; 7.00 times faster
• D)1360 km/s; 0.143 times slower
• E)Both gases have the same u_rms at 25\(\degree\)C.

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The degree to which behaviors, decisions, or actions are in alignment with accepted moral standards and principles.

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