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cem152-ss08-key-exam1B - CEM 152 SSOS Name ~ ‘ M GREEN...

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Unformatted text preview: CEM 152 SSOS Name: ,. , ~ ‘ M GREEN UXA Exam 113 — Jan 30,2008 PID: Answer each question in the space provided. Clearly mark your final answer. Show all work for full credit. 1. (12 pts) A 4.0 L container holds equal molar amounts of N2, 02, and C02 gases with at total pressure of 5.9 atm at 25.3 0C. What is the partial pressure of 02 in the mixture? 9101' 2.5.Cl cle l L molw ”“an 0“ XOL: 5 (2%” ‘ a 3 mew‘l“) par. 3 (C,clal-vw3(l,;) :ilfn él‘flnl 2. (10 pts) In lecture, the equilibrium vapor pressure of acetone at 25 °C was measured using a manometer. Acetone has AHVap = 31.3 kJ/mol. If the same demonstration were repeated with glycerine (AHvap = 91.7 kJ/mol), would the manometer reading be greater than, less than, or equal to that of acetone? Briefly justify your answer. Wanna ml—e/v V‘C“0l'c‘*6 W1” 196 lCS)‘ ‘hataw act‘l-on( t(<0(1;:9) 3 (/\\~¢b\(w AW“? Wang (“LOW—‘2)!”(kkrmclea (0V (”R’aCI‘O'fJ‘ 33‘ #4 5W chclx/pe) lt$§ Mkuk.‘ |;‘\ M (3kg PRASC "‘ W9“ V‘p‘ W‘l( La \OWU 3. (12 pts) Which of the following statements, regarding the properties of gases, are true? a. The molecules of a gas have random, chaotic motion. ’1‘ . . . . b. The pressure exerted by a gas 1s due to colllslon of the gas molecules w1th T the walls of the container. 0. The temperature of a gas is a measure of the avera 6 potential energy of l: g the constituent molecules. [1 d. Vapors of ethylene glycol (antifreeze) do not mix with water vapor. Name: - CEM 152 ssos PID: 69(19er exam Exam lB—Jan 30, 2008 4. (12 pts) Calculate the density of MgO (in g/cm3), which has a primitive cubic structure with an Mg — 0 bond distance of 4.21 angstroms. D; m.“ Nags; Vmw ¥ QWMWLJ v (UM Nk O .3 (1‘13le4 ‘l‘LOfilM/fl) xicvwlami‘s (tel U~01XL013 Wregccplvs ( VVIP‘L ’7, :, 33W! 1km ) gluw‘C‘r c~e(( J 3 “Ni (0 3a (4)” L304} Vslvw = 04.2.: wt) cm) -: ____._ uvfiirceV [3 9 3.3V! ¥t0§139/VIA\+ cc“ : lay“ ‘lfilwé; { 7 ”1) cwg/UmTl cel( 7~Wa><xa 5. (10 pts) Calculate the density of N20 (in g/L) gas at 0.5 atm and T = 1350 K assuming ideal behavior. ' M(T/l:K(:15m [3: pm {@SdmlWH/MHLMM) .1 lam 5/1,‘ RT Lo.0€\’106”“lm3( (3:0 L) 6. (12 pts) Determine whether each statement below, pertaining to intermolecular interactions, is true or false. T a. Hydrogen bonding can occur between H and F atoms. T b. The attractive force between CO and Ar atoms in the gas phase can be characterized as a dipole-induced dipole interaction. T c. Polarizability is the ability for a molecule to acquire an instantaneous electric dipole moment. '1'“ (1. Liquid CO has a higher boiling point than liquid N2 due to the dipole— dipole interactions between CO molecules. Name: _ . CEM 152 $308 PID: (9 “77’ N WM” Exam 1B — Jan 30, 2008 7. (10 pts) The vapor pressure curve for liquid lead is provided below. What is the normal boiling point of this substance. T(boiling) = 2000 K 8. (12 pts) The phase diagram for helium at low temperatures given to the right. Determine whether each of the following statements about the diagram is true or false. a. HCP helium is more dense than BCC helium. b. Point D is a critical point. c. Point C is a triple point. d. Helium is in the gas phase at atmospheric pressure (P=0.1 MPa) and absolute zero temperature 1 (T=0 K). Normal Liquid ‘ , ”(#450167 Pressure {MPa) 0 1 2 3 4 5 6 Temperature (K) 9. (10 pts) An unknown gas effuses at a rate that is 2 times slower than 02(g) at the same temperature. What is the molecular weight of the unknown gas? R?’ W; (2-7:. iROZ I 2K2-r-KOX K‘W o 7 _ xii—2:4“. M9 ; Lt lEZj/WO 2R. _. {K : {2%37wr’q ...
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