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Homework 9-problems (1)

# Homework 9-problems (1) - ruisi(hhr239 Homework 9...

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ruisi (hhr239) – Homework 9 – sutcliffe – (50985) 1 This print-out should have 22 questions. Multiple-choice 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( ) is 0 . 138 J / g · C. Answer in units of cal. 005 10.0 points How much energy would be required to melt 70 g of HCl at its melting point of - 110 . 8 C?

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