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Homework 23

# Homework 23 - Gozick Brandon – Homework 23 – Due Dec 8...

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Unformatted text preview: Gozick, Brandon – Homework 23 – Due: Dec 8 2006, 5:00 pm – Inst: D Weathers 1 This print-out should have 10 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 2) 10 points An ideal gas initially at 477 K undergoes an isobaric expansion at 6 kPa. If the volume increases from 0 . 8 m 3 to . 9 m 3 and 18 . 1 kJ of thermal energy is trans- ferredtothegas, findthechangeinitsinternal energy. Correct answer: 17 . 5 kJ. Explanation: Given : P = 6 kPa , V f = 0 . 9 m 3 , V i = 0 . 8 m 3 , and T i = 477 K . From the first law of thermodynamics Δ U = Q- W = Q- P ( V f- V i ) = 18 . 1 kJ- (6 kPa)(0 . 9 m 3- . 8 m 3 ) = 17 . 5 kJ . 002 (part 2 of 2) 10 points Find the final temperature of the gas. Correct answer: 536 . 625 K. Explanation: From the ideal gas law V i T i = V f T f T f = V f T i V i = (0 . 9 m 3 )(477 K) (0 . 8 m 3 ) = 536 . 625 K . keywords: 003 (part 1 of 1) 10 points Given: R = 8 . 31 J / K / mol , 5 mol of an ideal gas is kept at 3 ◦ C in an expansion from 1 L to 5 L . How much work is done by the gas? Correct answer: 18456 . 7 J. Explanation: Let : n = 5 mol , R = 8 . 31 J / K / mol , T = 3 ◦ C = 276 K , V f = 5 L , and V i = 1 L ....
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Homework 23 - Gozick Brandon – Homework 23 – Due Dec 8...

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