Finalinclassprobs

# Finalinclassprobs - Professor Farmer, I'm having some...

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Professor Farmer, I'm having some difficulty with the MCweb assignments due tomorrow (partial pressure and gas law visualization). I can get some of the answers to the partial pressure assignment, but when it asks problems concerning two separate gases connected by a valve such as "A 88.0L cylinder containing C 2 H 2 at a pressure of 6.00atm is connected by a valve to 2.00L cylinder containing SO 3 at 3.50 atm pressure. Calculate the partial pressure (atm) of C 2 H 2 when the valve is opened; Molecular Mass, C 2 H 2 26.018, SO 3 80.063“ I don't know how to approach it. I'm sure it must be simple calculations, but I'm stumped. Thanks for any help in advance.

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How to get started: First write down what you know 88.0L C 2 H 2 at 6.00 atm P 1 V 1 2.00L SO 3 at 3.50 atm P 1 V 1 Key to solution: connected by a valve … what is partial pressure (atm of C 2 H 2 when the valve is opened need V 2 for both at end, solve for each P separately, then add together to get total and partial pressures C 2 H 2 P 1 V 1 SO 3 P 1 V 1 before 88.0L 2.00L C 2 H 2 P 2 V 2 SO 3 P 2 V 2 after 90.0L
C 2 H 2 P 1 V 1 SO 3 P 1 V 1 before 88.0L 2.00L C 2 H 2 P 2 V 2 SO 3 P 2 V 2 after 90.0L C 2 H 2 88.0L at 6.00 atm = 90.0L at P e 2.00L SO 3 at 3.50 atm = 90.0L at P s (2.00L)(3.50 atm) 90.0L P s = = 0.078 atm SO 3 P e = (88.0L)(6.00 atm) 90.0L = 5.87 atm C 2 H 2

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Study Hints for Final: Study Hints for Final: For all chapters: 1) Go over concept review questions 2) Go back over MCWeb problems, be familiar with types of questions ~ 40% of test For new material 1) Practice MO problems for diatoms, know the different orbital energy diagrams- just memorize! 2) PV=nRT questions- there will be! 3) Molarity/Stoichiometry questions- yes! and balancing equations- get use to it! 1) Partial pressure question- of course! 2) Combination questions- only a few. Breakdown: Midterm 1 ~ 15%, Midterm 2 ~ 30%, New material ~ 55%
photon = 2.18 x 10 -18 J x (1/25 - 1/9) E photon = E = -1.55 x 10 -19 J λ = 6.63 x 10 -34 (J•s) x 3.00 x 10 8 (m/s)/1.55 x 10 -19 J λ = 1280 nm Calculate the wavelength (in nm) of a photon emitted by a hydrogen atom when its electron drops from the n = 5 state to the n = 3 state. E

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## This note was uploaded on 04/25/2008 for the course CHEM 1A taught by Professor Tobias during the Fall '01 term at UC Irvine.

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Finalinclassprobs - Professor Farmer, I'm having some...

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