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# 3. The Temperature is 300K. Oxygen (02) has a molar mass of 32.0 g/mol. (a) What is the average translational kinetic energy of an oxygen molecule?

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3. The Temperature is 300K. Oxygen (02) has a molar mass of 32.0 g/mol. (a) What is the average translational kinetic energy of an oxygen molecule? (b) What is the average value of the square of its speed? (c) What is the root-mean-square speed? (d) What is the momentum of an oxygen molecule traveling at this speed? (e) Suppose an oxygen molecule traveling at this speed bounces back and forth betweenopposite sides of a cubical vessel 0.10 m on a side. What is the average force the moleculeexerts on one of the walls of the container? (Assume that the molecule’s velocity isperpendicular to the two sides that it strikes.) (f) What is the average force per unit area? (g) How many oxygen molecules traveling at this speed are necessary to produce an averagepressure of 1 atm? (h) Compute the number of oxygen molecules that are actually contained in a vessel of this sizeat 300 K and atmospheric pressure. (i) Your answer for part (h) should be three times as large as the answer for part (g). Wheredoes this discrepancy arise?