An Oxygen Molecule Falls in a Vacuum

question 20

Multiple Choice

An oxygen molecule falls in a vacuum. From what height must it fall so that its kinetic energy at the bottom equals the average energy of an oxygen molecule at 800 K? (The Boltzmann constant is 1.38 × 10^-23 J/K, the molecular weight of oxygen is 32.0 g/mol, and Avogadro's number is 6.022 × 10²³ molecules/mol.)

• A) 31.8 km
• B) 10.6 km
• C) 21.1 km
• D) 42.3 km

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