Mid1GradeKey

Mid1GradeKey - Chemistry 13 100 points Gas Constant 8.314 J...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Chemistry 13 100 points Gas Constant 8.314 J K'1 mol‘1 = 0.08206 L atm K‘1 mol“ Show Your Work Do Not Remove Any Pages Do not 0 en test until told to be in R First letter of your last name: Midterm 1 April 18, 2008 PERIODIC TABLE m 3 Mn t n r P 0 71 111 3.0 175.0 103 Lr 262 7 Yb 17 69 Tm 168.9 101 M11 258 68 Er 167.3 100 Fm 257 67 Ho 164.9 99 Es 252 65 66 Th Dy 158.9 162.5 98 Cf 251 64 Cd 157.2 63 En 152 0 9 4 l ) 8.16. d 841 0 9 ( 4 95 96 97 Am Cm Bk 44 243 247 247 Na m m 3 9 2 o . . 5 1 1 5 l .2 n . . 5 5 1 1 2 ) 7 1 (\ 4 8 x) 09.4 .Mgw fiEE 9 Pu 2 61 Pm (145) 93 NP 237 60 N11 144.2 92 U 231.0 238.0 91 Pa 57 58 59 La Ce Pr WWW!” 138.9 140.1 14119 89 Actinides Ac 227 FED ON mug @"F‘ 300$ @MES w \T’Pr QME LEA/W, (Page pOints) (Page pOints) (Page pOints) :> man—r71; you/(L 53025 -~ Tom mm ‘PW Av 5? SD 1? H—L 96 Lo 7 gov [Wt/4.9 SEW/CAVE “PROBLEM , WIT-H (9‘4 ON “77% PAGE - @wuazPAQg V i i \ W l H ‘ ‘ Q? ‘ L4 m/ bulk {\M/M (1)(25 pts) The balanced cow'Lustion reaction for methanol (CH30H) is shown below: V CH3OH (I) + 02 (g) a (:02 (g) + H2‘O(g) *al The enthalpy change for this reaction (AHreax ) is -397.0 kJ (circle the correct answer in parts a-e) ‘ (a)(3 pts) The reaction is endothermic. T o@ (b)(3 pts) We know FOR SURE that the reaction is spontaneous. T o@ (c)(3 pts) If we do this reaction i a calorimeter, AT for the calorimeter will be positive (+). or F (d)(3 pts) If we do this reaction in a balloon at a consta t temperature, the balloon will decrease in volume. T o@ x \_ (e)(3 pts) It is LIKELY that ASreax is ‘I - 've (—). T o@ (f)(10 pts) At constant P and at lculate values for each quantity in the equation AE = q + w. (Express all answers in kJ) 00‘ *AE "3%5 RT “w "' Znfiflk I L w *- "'>AV‘= FVC'E’TAH 07') *= ~l2TC?vueQ2~l («149% =——i2’T 7 .. 6w 3757' 4M 9P *1 ‘3- AE ~+PAV 5+ I" / 4cm é 2 (2)(3O pts) A reaction absorbs/ eat from its surroundings. If the heat the reaction absorbs is 1355 J, answer the questions below: (a)(3 pts) The reaction is exothermic. T or® \M/l (b)(9 pts) The reaction occurs at constant volume in a calorimeter that has a heat capacity C of 0.750 kJ deg— 1. What is AT for the calorimeter? AT=_:Lg/_&;_2§_ . ‘= C At 4.333191 K 0,757. may. -—l * Al: : fi/o 2 Q 853‘ ,zr‘xdeol ‘W/X) /0y Wylie! I (c)(9 pts) The reaction occurs in solution in a calorimeter that contains 895.0 g of water with a specific heat capacity of 4.18 J deg"1 g ' 1. What is AT for the solution? AT = ~-—Qz’3é em *0/ 17L ‘. ‘fl 4353“? K @6250? @7. Elke“); ’ a K, ‘ (WE 0%) (Wake?!) _ (d)(9 pts) The heat absorbed by the reaction is magicall obtained from 30.00 moles of Ne (g) in a sealed con i r at, n, " L, For Ne (g): Cbmm/W an c .,=<12.47J del'l mol‘ 1;“ What is AT for the Ne (g) in the container? AT = / g m: At 43$: 3- ) (GI) "7 @gflX/M‘ZEqfi/w we ' ijfiflafl’w : é? 12.5 - “"0 f3 3 (3)(10 pts) When a 0.0100 mole sample of solid AgN03 and a 0.0100 mole sample of solid NaCl are dissolved in 100.0 mL of water at an initial temperature of 22.60 °C, the reaction shown below occurs. and the temperature of the solution increases to 24.20 °C. Ag+ (aq) + 0' (aq) —> AgCI (5) (9/0/6233 WM arbloflth' 010/901th ’ If the specific heat capacity of the solution is 4.18 J deg-l1 9'1 and the mass of the solution is 100.0 g, calculate AH in kJ for til; ' formation of 1 mole of AgCl. AH (kJ/mole) = '1an (7 (LA / W81 (Slam—w gaze ‘= (flew,ch(ll/Mylmmya/w) a: aéémfi— I gm" 9 09”” fpc‘r’ V I A “2?; '5 “04%le 550' f) Mkmflfi’?) ":- “‘0réé%/ 2,010 :— e.(¢¢,.g;¢ (QT/1419K (4)(10 pts) Given the following data: £71) 2 03 (9) SE 3 02 (9D éWLéH = -427 kag . V 1IL) 02(9) 20(9)) xl/L H=+495 kJW @DCNMQ) + 0(9) N02 (9)) WQH = -233 kJ ) k(&ulate AH for the reaction: _. Now) + 03 (g) —> N02 (9) + 02 (g) AH= 137’ kJ 4 (5)(25 pts) The following reaction has the values of AHfo (kJ/mole) and 50 (J deg' 1 moi' 1) for each compound shown in the reaction: Fe203 (s) + 1H2 (g) —> Z_Fe(s) + _3_H20(9) AHf°(kJ/mo|) —826 0 , 0 -242 S°(J deg' 1 mol‘ 1) +90 +131 +27 +189 r \ gooro‘rC _ (a)(9 pts)Caicu|ate AHOreax, ASOreax, and’ AGOreax at 399K (showzunits). - ,4 i ASOrea AGoreax ' (fig ’2? AH“? “77*?” = + 'WhTr-Gw ©(Mzg2rflfia7wz = “wit? ~~ C—I— HM im- e _ 39751}: x EOOIO {/C (c)(4 pts) If AGOreax = LRTan, what is K for this reaction at -~ K ,3 X 10 “‘1‘ fl 4 , +584” A @Eiv)(0,¢9oo 7 S‘gié)/ZZQ‘3/9(0'OnfiD/g£9@ '27 ~23]. new? (west Um" (d)(3 pts) The reaction is spontaneous. T o ' (e)(5‘- pts) Write the reaction that corresponds to AHfO fOr Fe203 (s). ZF’é/(‘Q tag/jazfg) Rug; {5) ...
View Full Document

This note was uploaded on 08/06/2008 for the course CHEM 1B taught by Professor Watts during the Spring '08 term at UCSB.

Page1 / 6

Mid1GradeKey - Chemistry 13 100 points Gas Constant 8.314 J...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online