Q1.ans - Chemistry 114 ' Quiz 1 Spring 2010 Name: Some...

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Unformatted text preview: Chemistry 114 ' Quiz 1 Spring 2010 Name: Some potentially useful information is on the reverse side of this page. You must show all. of your work and use signifiCant figures. 1. At its normal boiling point of 100°C the-heat of vaporization of water is 2.256 kJ g‘l. The 1 specific heat capacity of liquid water is 4.184 J g"1 K"1 and the specific heat of gaseous water is 1.92 J g—1 K’l. a) (10 pts) What is the heat of vaporization of 1.00 g water at 60°C? Wee uggo 01,an “a, Macs) Wm cm, mg madam» if luwu My; ill)too%3 -—-7 Lilo (figment) . @Mfliib Hlo tame) a 7 . g , . p p a ulotiiwcy 4.», [4210 (flfitmil) .- upo UL)an C> out 4’, i I? HLO L3) moat) uloifigww) —-’->: ua‘ut’ifiximgcfi; ' _ g,ng (5)@.@9¢> Auwtwm :- (31%” an“ me ‘~ (L00) (4.3%» (mm w) + (neoflafiwa 1: m3) ,( (“3930‘qu (ammo) '~ lH’éfo +21% v%33° ' ~ . > must: a ma” 6 b) (5 pts) What is the entropy of vaporization of water? near . we Dim/J3“ WM» lop; 1W0 -2- 2. (ill pts) Use bond enthalpies to estimate the enthalpy change for ' C02(g) + 4 F2(g) —> (354(8) + 2 0F2(g) '5 F Outta" 0 F F- F’Cq: F’O' F a 0:0 Uni—F Lt cw? Ll. 04F bu” % {5E LWQ" m: (Eu-WA : 5M6 CV5 + bulb (v!) v '1wa L “£553 ; iMM© 4,- V4 (mail - .‘ V f “v ' 5% 9 k3 Potentially Useful Information PV : nRTV . ' l t q-V =rAE (Only PV work) - q 2 CAT . ' - qp 2 AH (only PV work) AE = q + w I ‘ v » w = —PextAV (PV'Work) H = E + PV K: 0C + 273.15 R = 8.31451 J mor1 K—1 = 0.0820578L atm moi—1 K-1 Average Bond Energies (kJ mol'l)‘ ‘ Chemistry 1 14 Quizl Spring 2010 Name: Some potentially useful information is on the reverse side of this page. You must show all of your work and use significant figures. 1. (9 pts) In car engines, methanol needs to be in the gas phase to react. Determine the amount of heat in U that must be added to 1.00 kg of liquid methanol at 25.0°C to vaporize it at its nor- mal boiling point of 650°C. For CH3OH(I): AHvap = 38 kJ/mol, cP = 81.6 J K“ moi—1, M = 32.0416 g/ 01 , , m cuéea (1,39% q edges (§,e5”£§ MA“ 713%, Cabot; (L) (as “(12> (1.0mm?) «31.0 Coiefifia \l %P" ALP» Au\4' Aug", > aae‘m 2 now“ + n Anne — a? (1.00x:03\)[‘68)/33.Q‘ttg " 1.5!“); 2. (6. pts) In the vapor phase methanol can react with oxygen in the air. Use average bond - enthalpies to estimate the enthalpy change for the combustion of one mole of gaseous methanol. (Miami + 3i39lifi‘} Q Cfigfifi‘} + @LE‘EGLU) . ‘t‘ \;-(‘:,.,O,H E93“ ngzo H‘D‘U H . sit—LE @ Q‘s/'0 3’0"" \ (>0 Ill-tom; I» tag (was) _ 3g {Fwd M "v 304125).» "55% + 3’/‘2 (H6553 ilWlfi) *r 30ml} 3 3. (2 pts) Give the equation whose enthalpy change is defined to be AH g [CH3 OH(g)]. '- (9 d . C(sflrfi gut;th a, knits} .b ougm (3*) 4. (4 pts) Use values-of AH? to estimate the enthalpy change for the combustion reaction. 1 2 “Frog, €§r§5~\ ‘ Z “Luci; J / — 3%th glass: as) v (-291.05 = View. swim -2- 5.’ (4 pts) Consider methanol being burned inside a cylinder whose radius is 4.0 cm. If the pis- ton moves 12 cm in one stroke, calculate the work done on the gas per stroke as it expands against an external pressure of 1.00 atrn. ' awasmrw Qarwleoww ’/ Resgiindlee " “'3' («Y’V’M‘ “v - PA A): <— vct‘eflrr (M-DCMS‘E‘W(|1€«M\}(‘MLBE I ' 0:19 3 " 0.120% 9r 3 $7 Potentially Useful Information PV = nRT qv 2 AE (with only PV work) q = CAT qp = AH (with only PV work) AB = q + w w = —PextAV (P V work) H = E + PV K = °C + 273.15 R = 8.314472 J morl K“ = 0.082057 L atm-mol" K“ P=1 atm=760nnan= 1.01325 bar Selected Average Bond Enthalpies (kJ rnol“) C-C 348 C—0 358 C-H 413 H~H 436 C=C 614 C=O 799 0-H 463 02 495 Selected Standard Enthalpies of Formation (kJ/mol) CH3OH(aq) —245 .9 CH3 OH(l) —238.4 CH3 OH(g) -201.0 H200) ~285.83 H20(g) -241.83 C02(g) -393.509 C02(aq) -413.80 Chemistry 1 14 Quizl Spring 2010 Name: Some potentially useful information is on the reverse side of this page. You must show all of your work and use significant figures. 1. The temperature of a constant volume bomb calorimeter rises by 297°C when one mole of solid sucrose (CIZHZZOH) is combusted. AH and AE for the combustion of sucrose are -5644 and -5650 while AH?[COZ(g)] and AH?[H20(1)] are -393.509 and -285.83 kJ mol“, respec~ tively. a) (3 pts) Write a balanced chemical equation for the combustion. £E$HJQ®H€Q* ‘wafijdg ilwfimg‘fi * “Mama b) (10 pts) Determine the standard enthalpy of formation of sucrose in kJ mol“. ARGO/9mg: Z “ft-9‘1va 3&3. (good) v 2 vx ll “2 M_.c:l:r a misfit Temp} k u Margit»: - A Mi EC .Lctnouasfl I '3 \ \ e icrz/R3xbonb531 c tltvsas. soak uttvmsgaé ‘ (v SUN) 1 1111. 3:53? :7 villa. ‘i’iflwwfl c) (6 pts) Calculate the heat capacity of the calorimeter. fifv‘r 3 63??! *' fiffistf D '47 %mt wcbm i v Al?” =«- flag/RT Age: v 51950 $63 :\ eta-L: \ Z w Quefi$ “1 WW ‘95 ‘hfllt _2_ d) (3 pts) What is w for the bomb contents? bot - we; ZN“) Man a Wm e) (3 pts) What is q for the bomb contents? a)“; Ag: (43335563 (EM): v 51350 “903? Potentially Useful Information PV = nRT _ qv = AE (only PV work) q = CAT I qp = AH (only PV work) AE = q + w w = —PextAV (PV work) H = E + PV K = °C + 273.15 R = 8.314472 J motl K" = 0.082057 L atm mol—l K—1 ...
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Q1.ans - Chemistry 114 ' Quiz 1 Spring 2010 Name: Some...

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