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Homework_24

# Homework_24 - Nguyen Thanh Homework 24 Due Dec 7 2007 7:00...

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Nguyen, Thanh – Homework 24 – Due: Dec 7 2007, 7:00 pm – Inst: D Weathers 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points The molar mass of O 2 is 32 g / mol, and the molar mass of He is 4 g / mol. The rms speed of a helium atom at room temperature is 1655 m / s. What is the rms speed of an oxygen (O 2 ) molecule at this temperature? Correct answer: 585 . 131 m / s. Explanation: Let : v He = 1655 m / s , m He = 4 g / mol and m O 2 = 32 g / mol . According to the molecular model of ideal gas, v He = s 3 k B T m He v O 2 = s 3 k B T m O 2 v O 2 v He = r m He m O 2 v O 2 = v He r m He m O 2 = (1655 m / s) s 4 g / mol 32 g / mol = 585 . 131 m / s . keywords: 002 (part 1 of 1) 10 points The universal gas constant is 8 . 31451 J / K · mol. Calculate the change in internal energy of 1 mol of helium gas when its temperature is increased by 6 . 1 K. Correct answer: 76 . 0778 J. Explanation: Given : n = 1 , R = 8 . 31451 J / K · mol and Δ T = 6 . 1 K .

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