Exam4.3 - Chemistry 1715 Exam 4_009B 15 Use the given...

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Unformatted text preview: Chemistry 1715: Exam 4_009B November 17, 2009 15. Use the given stande enthalpies of formation to calculate AH" for the following reaction 9.01.61» 3FezO3(s) + CO(g) —> 2Fe304(s) + CO2 (g). Species EEO-f, kjfmol 1....» ., Fe203 {s} —824.2 KMMMM'MW"”WWW"!mi , \ 17.230419) 4113.4 A110: EH? ‘ 910$:2'f 1 mil} (20(3) —111J.5 v” ' M 1:021:31 -393.5 —5213.4k.l —577.2k.l —47.2.kJ +472 kl 16. Two solutions each at 15.7°C are mixed in a coffee cup calorimeter and allowed to react. Immediately after mixing the temperature of the mixture is 202°C. From this observation, one can conclude that the reaction is and that AH for the reaction is a Endothermic, negative b. c. d. e. Exothermic, negative Exothermic, positive Endothermic, positive Not enough information to draw a conclusion. 17. A student added 48.7 mL of water (at 84.7 DC) to a calorimeter containing 50.0 mL of water at 237°C. Calculate the calorimeter constant if the final temperature of the water was 51.1 C a. b. c. d. e. 16.4 J/"C 7.2 J/°C 40.7 J/°C 71.4 J/°C 22.2 J/°C 18. Using the portion of the activity series for oxidation half reactions below determine which reaction will NOT occur. Ca(s) ——> Ca2+ (aq) + 2e‘ Mg(s) —> Mg2+ (aq) + 2e’ Zn(s) —> Zn2+ (aq) + 2e" Cu(s) —) Cu2+ (aq) + 2e" 21. Ca(s) with Cu2+ (aq) b. Ca(s) with Zn2+ (aq) c. Zn(sb with Cu“ (aq) d. Zn(s) with Mg“ (aq) ...
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