quiz1_key - Chemistry 1 14 Quizl Fall 2007 Name: Some...

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Unformatted text preview: Chemistry 1 14 Quizl Fall 2007 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. One mole of solid sucrose (C12H22011)is combusted in ja‘constant volume bomb calorimeter. The temperature of the caIOrimeter rises by,2.97 °C. AE andiAH for the combustion of sucrose \ is -5650 kJ mol‘1 and -5644 kJ mol'l, respectively. AH?.[C02(g)] = 393.509 kJ mold/land AH?[H20(1)] = -285.83 kJ mol*‘. 3) Write a balanced chemical equation for the combustion. (2 Pts) Managua» + new} .3 132%;th .4.» u tie/am b) Calculate the standard enthalpy 'of formation of sucrose in k] marl. I i (6 pts) , ' ‘ Alfieme Ebwwhwittmm ~ 3* pm“ 13% (Mew a is. magi: Iwmtggt u as: Insoltflv Au: [Canada gfigicnuusfi} \Moatrssm » n (I mass“) — (~ 5W4) v ~3Qt3a1.l§% :7 v 9.111 M may" MWW l mmbmtedt c) Calculate the heat capacity of the calorimeter. (6 pts) $101 ‘ 05‘: “ 3:.sz : 3 éifait" E‘s" " Mgr; ‘ CM: AT ,e A E7 ~— sostt tn E v _ W m __ ( 1M) ‘ ‘ (LEAK: 2 LQD x m3 t: K" d) What is q for the bomb contents? (2 W) i)“: ALL: (-5050 {Mme/“ABUMV “539559” #25 e) What is w for the bomb contents? V (2 PIS) 2. What did the lecture demonstration on cooking an egg illustrate where calcium oxide was added to water? - Potentially Useful Information PV 2 nRT qv = AE (only PV work) q = CAT qp = AH (only PV work) AE = q + w ' w = —PextAV (PV work) H = E + PV K 2 °C + 273.15 R = 8.314472 J Incl-1 K'1 = 0.082057 L atm moi—1 K’l Chemistry 1 14 Quizl Fall 2007 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. Write a balanced equation for the combustion of ethane, C2H6(g), to form C02(g) and H200). ' I ‘ (5 pts) :1 gum} +— 1099 a a 2,0th) + who (as 2. Determine the change in enthalpy for the combustion reaction. (5 pts) 8H0 w a a) O r! ‘“ Freak“ imfi‘Aifie (prefix vii, firwfiu AH QCreaol\ 5 Manama} wl’mma)- skews) —. - 3mm :7 “31%.Bl'icj 3. Determine the change in standard internal energy for the combustion reaction. 5 AE": AHDV mm“ -r Maw ETA“ ., zamzuu— (aamwmw)(mafia—q» = «31.11.34, +- -Ia,3qq =7 ‘4 awaaa ids” 4. Give a physical explanation for the PV work done during the combustion. What is the sign of the work done by the system? Show your reasoning. (5 pts) 0») rrxw/swfimvzgocsfimwolflwets égw'ifiblr’wtefi“? male L6 We? Jim; {in Mamie (damagin- 7 » b§wfisvwl9mt Ax} > 0‘ .21»), Mr $43- > «to W / M'Av' @LO Chemistry 114 Quiz 1 Fall 2007 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. What is the heat of vaporization of 1.00 g water at 60°C? The 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. (10 pts) 7 I uaotmm ~44? Hap {mafia I 143,011 we) a 1139M. ; mom Au‘ ‘L T AH?) _ \vlggéfii 100%} KQ§Q€> ,_ H10 (9900531) F? Hal?” kigfificb , 1430(5fl3wa) ‘7’ Mao ( . u1L 11mph? < Ml? +41%“ 4% Mil} : (1.00.31 WM Sg‘W‘E trevvww )2 (mm (1.9.59 “03) Jr 0.00M L693 1 (204%) 1 [(pcltEir l” 1154p " :Hyfi : 33%b.5ip ‘1“? 2350 j I I I ' o!" 3.3:? $23“ 2. Use bond enthalpies to estimate the enthalpy change for C02(g) + 4 F2(g) —> CF40?) + 2 0F2(g) Pva-F I P 3cm m2? LN:va H 0'F Mm ’41 Bg {Wank-3“ 15!? {$13M : Malawi. (4‘) 4:» bags wagfifi I: 2.02th “10553 ’ Lilq€5\ 4:4qu u», auo a $400 as. » 560 as Chemistry 114 Quiz 1 Fall 2007 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. Write a balanced equation for the combustion of one mole of acetylene gas, C2H2(g). (5. ptS) ‘ Cal-\QVCSXB ,‘l’ Ella&{3\ “’7 9‘ to; +4 ‘ 2. Use standard enthalpies of formation to calculate AH" for the combustion reaction. (5 pts) 0 - Q a ; (1 AH t fad)" W “ARV {max A.“ W (“L WW" £9 9 rem» WM . Q“ ' .. Mumassfi «$55.33 w 2%.?3 z. mmfi’rfiW :7 quasajg 4%.? 3. Use average bond enthalpies to estimate AH ° for the combustion reaction. 1 c4; _ 5119; H 0,210 33% 1 we ‘ mgimx :5; EE LML§'\W Egg {imam a boobs Weed (3‘) r 399% Wmfi 6‘) gum» asst $5.3. (ml— ”l"(“%il‘§”\7names“; anaemia/3’ 4. Estimate the molar enthalpy of vaporization of water from the above information. (5pt8)mE;s7 Maoiflfia Han 35$“ “£3533 3x lléi‘i.5% ~ “mt? a aggugea M 3m} MW! ...
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This note was uploaded on 07/17/2008 for the course CHEM 114 taught by Professor Jursich during the Summer '08 term at Ill. Chicago.

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quiz1_key - Chemistry 1 14 Quizl Fall 2007 Name: Some...

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