Chapter 5 - Chapter 5 Gases and the Kinetic-Molecular Theory 1 A ballerina weighs 103 lbs and is up on her toes with only 10.0 cm2 of her slippers in

Chapter 5 - Chapter 5 Gases and the Kinetic-Molecular...

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Page 66 Chapter 5: Gases and the Kinetic-Molecular Theory 1. A ballerina weighs 103 lbs and is up on her toes with only 10.0 cm2of her slippers in contact with the floor. What pressure is she exerting on the floor? A) 4.59 × 105Pa D) 4.59 × 10-1Pa B) 4.59 × 103Pa E) 4.59 × 10-3Pa C) 4.59 × 101Pa Ans: A Difficulty: M 2. Given that pressure has dimensions of force ÷ area; that force has dimensions of mass × acceleration; and that the S.I. unit of pressure is the pascal, what is 1 pascal in terms of S.I. base units? 3. Mineral oil can be used in place of mercury in manometers when small pressure changes are to be measured. What is the pressure of an oxygen sample in mm of mineral oil if its pressure is 28.5 mm Hg? (dof mineral oil = 0.88 g/mL; dof Hg = 13.5 g/mL) 4. Mercury is 13.6 times as dense as liquid water. What would be the reading of a water-filled barometer at normal atmospheric pressure, 760. mmHg? 5. A flask containing helium gas is connected to an open-ended mercury manometer. The open end is exposed to the atmosphere, where the prevailing pressure is 752 torr. The mercury level in the open arm is 26 mm above that in the arm connected to the flask of helium. What is the helium pressure, in torr? A) –26 torr B) 26 torr C) 726 torr D) 778 torr E) none of the above Ans: D Difficulty: E
Chapter 5: Gases and the Kinetic-Molecular Theory Page 67 6. A flask containing neon gas is connected to an open-ended mercury manometer. The open end is exposed to the atmosphere, where the prevailing pressure is 745 torr. The mercury level in the open arm is 50. mm below that in the arm connected to the flask of neon. What is the neon pressure, in torr? 7. A flask containing argon gas is connected to a closed-ended mercury manometer. The closed end is under vacuum. If the mercury level in the closed arm is 230. mm above that in the arm connected to the flask, what is the argon pressure, in torr?

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