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Unformatted text preview: ruisi (hhr239) – Homework 9 – sutcliffe – (50985) 1 This printout should have 22 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. What’s the chemical formula of water? HIJKLMNO (a little geek humor for you) NOTE: Read the questions carefully. If it asks for a CHANGE (Delta) in a quantity or the VALUE of that quantity, then you must be sure to include the correct sign. Remem ber that the quantities are for the SYSTEM, unless stated differently, and sometimes we switch our viewpoint of what the system is once we have finished a calculation. This cov ers Ch. 9. The rest will be on HW 10, the last HW. 001 10.0 points When a hydrocarbon is burned in the pres ence of oxygen, the amount of energy in the universe 1. decreases. 2. stays the same. 3. increases. 002 10.0 points A sample of an ideal gas having a volume of 0.612 L at 298 K and 10.0 atm pressure is al lowed to expand against a constant opposing pressure of 0.576 atm until it has a volume of 1.000 L at 200 K and the pressure equals the opposing pressure. What is the work for the system? Answer in units of J. 003 10.0 points A CD player and its battery together do 500 kJ of work, and the battery also releases 250 kJ of energy as heat and the CD player re leases 50 kJ as heat due to friction from spin ning. What is the change in internal energy of the system, with the system regarded as the CD player alone? Assume that the bat tery does 500 kJ of work on the CD player, which then does the same amount of work on the surroundings. 1. 50 kJ 2. 800 kJ 3. 550 kJ 4. 950 kJ 5. +450 kJ 004 10.0 points Calculate the energy required to heat 908 g of mercury from 37 ◦ C to 42 ◦ C. The specific heat capacity of Hg( ℓ ) is 0 . 138 J / g · ◦ C. Answer in units of cal....
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This note was uploaded on 12/11/2010 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas at Austin.
 Fall '07
 Fakhreddine/Lyon

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