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Unformatted text preview: padilla (tp5647) – HW11: Gases II/Intermolecular forces I – shear – (52375) 1 This print-out should have 28 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Three of the primary components of air are carbon dioxide, nitrogen, and oxygen. In a sample containing a mixture of only these gases at exactly one atmosphere pressure, the partial pressures of carbon dioxide and ni- trogen are given as P CO 2 = 0 . 285 torr and P N 2 = 576 . 822 torr. What is the partial pres- sure of oxygen? Answer in units of torr. 002 10.0 points Two gases are contained in gas bulbs con- nected by a valve. Gas A is present in a 1 liter bulb at a pressure of 973 torr. Gas B ex- erts a pressure of 270 torr in a 1 liter bulb. The valve is opened and the two gases equi- librate. What is the partial pressure of gas A expressed after equilibration? Answer in units of torr. 003 10.0 points A sample of oxygen is collected in a 317 mL container over water at 15 ◦ C, and the barom- eter reads 747 torr. What volume would the dry gas occupy at 710 torr and 15 ◦ C? Water’s partial pressure at 15 ◦ C is 12 . 8 torr. Answer in units of mL. 004 10.0 points Consider two cylinders of gas, both with a volume of 25 L and at 1 atm and 25 ◦ C and the following statements. A. The temperature of the gases is different. B. The average kinetic energy of the gases is the same. C. The average molecular speed of the gases is the same. Which statements are true? 1. A and C only 2. A only 3. C only 4. B only 5. A and B only 6. B and C only 7. None is true. 8. All are true. 005 10.0 points At a given temperature, which gas has the lowest average molecular speed? 1. carbon dioxide 2. nitrogen 3. carbon monoxide 4. fluorine 5. chlorine 006 10.0 points If the average speed of a carbon dioxide molecule is 410 m · s − 1 at 25 ◦ C, what is the average speed of a molecule of methane at the same temperature?...
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- Spring '09
- Mole, Padilla, Gases II/Intermolecular forces