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HW4ques&soln - Chem 331...

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Unformatted text preview: Chem 331, Homework #4 (Thermochemistry) (Due Mon., Oct. 1st, 2007 at beginning of class) (1) Calculate the molar heat of vaporization of water at 25°C. The heat of vaporization of water at 100°C is 40.68 kJ/mol. (2) Calculate AHf and AU? at 298.15 K for the following reactions: (a) 4NH3(g) + 6N0(g) —> 5N2(g) + 6H20(g) (b) 2N0(g) + 020%) -9 2N02(g) (c) TiCl4(l) + 2H20(l) -—9 Ti02(s) + 4HCl(g) (d) CH3OH(g) + CO(g) —> CH3COOH(1) (3) The standard enthalpy of combustion for toluene (C7Hg) is ~3910.0 kJ/mol at 25°C. Calculate the enthalpy of formation of toluene. (4) Calculate AHf at 650 K for the reaction 4NH3(g) + 6N 0(g) —> 5N2(g) + 6H20(g) using the temperature dependence of the heat capacities given in Appendix B of the text. (5) 1.35 g of benzoic acid, C6H5COOH(S), is reacted with oxygen in a constant volume calorimeter to form H200) and C02(g) at 25°C. The mass of the water in the inner bath is 1.240 x 103 g. . The temperature of the calorimeter and its contents rises 3.45° as a result of this reaction. Calculate the calorimeter constant. (6) When nitroglycerin explodes, the chemical reaction that occurs can be assumed to be C3H5N309(1) —> 3C02(g) + %H20(g) + %N2(g) + 71-02%) (:1) Calculate AH f and AU 3 for this reaction at 298 K, given that the enthalpy of formation of liquid nitroglycerin at 25°C is ~3 72.4 kJ/mol. (b) Consider 0.20 mol of nitroglycerin at 25°C completely filling a constant volume cell of 0.030 L. Calculate the maximum temperature and pressure that would be generated by the explosion of the nitroglycerin if the constant-volume cell did not burst (or vaporize). You may assume that (1) the explosion occurs so rapidly that the conditions are adiabatic, (2) the pressure cell comes to immediate thermal equilibrium with the products, (3) the products are ideal gases, independent value of 100 J/K. . 2 «W, QLW 100 N4 = \ 8690410112) ”(T— : (QZS‘AOOO’ZS—v 25' = SIM-Flig- T Z: % if a 9.0%}; It? .A" ~" ~ mfg a)- 5.4qu; + 40.09? ~2520 3’ 4'32? 12—51”an . _ , @ . .4/‘N.43[53 + (ONOLQ., 7‘5.-. SN;(¢D3 3F .,_.é/?LZQ_(33., . .. ARE? ,-5'..(0._®.-+ @(«wfl ..—- at. (—43%: 0263/33 1 ”13?!ng ,9. ' fl [Mr—w xs' «mm-xmflaaesw .1 o3 ¥ :.] —:- an. N ' 1 (D *2 N01334: am” -—>» mm . j f as“: .1 a (.3 32.3 » .2/(91, $3 +— is, («5.03 ,, . ”gflqxblz, 463" . .. 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