Class Note for CHEM 112 at UMass(20)
Class Note for CHEM 112 at UMass(20)
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This 11 page Class Notes was uploaded by an elite notetaker on Friday February 6, 2015. The Class Notes belongs to a course at University of Massachusetts taught by a professor in Fall. Since its upload, it has received 17 views.
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Date Created: 02/06/15
What is standard atmospheric pressure 1 The air pressure at sea level 2 760 mm Hg 3 760 mm Hg 4 1 atm 5 01 atm 6 The air pressure in Amherst MA 7 The air pressure in Lander WY Which letter represents the normal boiling point of water mm mm A B V c son 3 Pressure mm Hg Diethyl ether has a vapor pressure of 760 mm Hg at 346 C and the enthalpy of vaporization of 281 kJmol What is the a vapor pressure of at 250 C a 120 mm Hg b 197 mm Hg c 346 mm Hg d 534 mm Hg we 4790 mm Hg L 1 ClausiusClapeyron equation AHVa lnP p 0 RT Why did the lighter have a small ame in Hasbrouck vs a large ame at Thai Blue Ginger A The elevation of Hasbrouck is higher so the pressure was higher B The elevation of Hasbrouck is higher so the pressure was lower C The lighter was colder in Hasbrouck so the vapor pressure ofthe butane was lower D The lighter was warmer in Hasbrouck so the vapor pressure ofthe butane was lower E The lighter was warmer at Thai Blue Ginger so the vapor pressure nffhn hllfama Alae ImAIer E3 01 Phase Diagrams Why learn about phase diagrams Phase Equilibria Water Piessure mm Hg Triple Point Water 453 mm Tempevatuie T At the TRIPLE POINT all three phases are in equilibrium 10 T C Normal boil point Normal freeze point Triple point Phase Diagrams Important Points for Water PmmHg Critical T and P CRITICAL Tand P Note that line lI39critical T critical High Pressure gt High Temperature gt As P and T increase you finally reach the goes straight up Above critical T no liquid exists no matter how high the pressure Critical T and P COMPOUND TEDC PEatm H20 co2 CH4 Freon12 CCI2F2 What do you predict Tc and Pc depend on 13 CO2 Phase Diagram 1 quotSnpemn aL Pmssum atm n31 c 71m 750 720 0 20 50 Temperature Cc 14 CO2 critical point 8 9 I 574 U m 9 Q Temperature K 15 For 002 what phase Changes occur between 100 C and 10001 aL I GLIII A Solid to liquid B Solid to liquid to gas C Solid to gas D Liquid to gas E liquid to supercritical 1 1 fluid l me am P1255 For CO2 what phase Changes occur between 391OOOC and 10001 at IL aLIII A Solid to liquid B Solid to liquid to gas C Solid to gas D Liquid to gas E liquid to supercritical fluid em emu l SolidLiquid Equilibria In any system if you increase P the DENSITY will go u Therefore as P goes up equilibrium favors phase with the larger density or SMALLER volumegram Liquid H20 Solid H20 Density 1 gcm3 0917 gcm3 cm3gram 1 Luv ICE 2 LIQUID H20 favored at favored at low P high P 18 SolidLiquid Equilibria ICE 2 LIQUID H20 favored at favored at low P high 1 Raising the pressure at constant T causes water iqgid to melt Send 2 Norm The NEGATIVE SLOPE of H20 freezmg the SL llne IS unique to pomt 760 HZO Almost everythlng mmHg else has positive slope 0 pc 19 l 39S tl39 573am Cn39tl39nalpnint a Liquid Pxessuve atm emu 750 720 u 20 511 Temperature at 20 SolidVapor Equilibria At P lt 458 mmHg and T lt 00098 c solid H20 can go directly to vapor nus process is called SUBLIMATION Can you think of any machine that uses sublimation 21 The vapor pressure of liquid ethane thiol C2H5SH is 100 mm Hg at 260 K A sample of C2H5SH is placed in a closed evacuated 521 mL container at a temperature of 260 K It is found that all of the C2H5SH is in the val or I hase and that the pressure is 570 mm Hg If the volume of the container is reduced to 390 mL at constant temperature which of the following statements are correct Choose all that apply The pressure in the container will be 760 mm Hg No condensation will occur Liquid ethane thiol will be present Only ethane thiol vapor will be present The pressure in the container will be 100 mm Hg WPPJNE P1V1T1P2V2T2 lt see page 554 for review 22
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