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hw27 - Version 001 HW27 gavrin(25111 This print-out should...

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Version 001 – HW27 – gavrin – (25111) 1 This print-out should have 13 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. SerwayCP1033 001 10.0points A weather balloon is designed to expand to a maximum radius of 25 m when in flight at its working altitude where the air pressure is 0 . 046 atm and the temperature is 192 K . If the balloon is filled at atmospheric pres- sure and 431 K , what is its radius at lift-off? Correct answer: m. FilledBalloon 002(part1of3)10.0points The molecular mass of helium is 4 g / mol, the Boltzmann’s constant is 1 . 38066 × 10 23 J / K, the universal gas constant is 8 . 31451 J / K · mol, and Avogadro’s number is 6 . 02214 × 10 23 1 / mol. Given: 1 atm = 101300 Pa. How many atoms of helium gas are required to fill a balloon to diameter 22 cm at 29 C and 1 . 187 atm? Correct answer: 1 . 60781 × 10 23 . 003(part2of3)10.0points What is the average kinetic energy of each helium atom? Correct answer: J.
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