Transcription of CHAPTER 5: ANSWERS TO ASSIGNED PROBLEMS Hauser- …
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CHAPTER 5: ANSWERS TO ASSIGNED PROBLEMS Hauser- …
1 CHAPTER 5: ANSWERS TO ASSIGNED PROBLEMS Hauser- General Chemistry I revised 10/14/08 CAUTION: Many different units are used in thermochemistry. Report the units! Also report the sign when appropriate! Consider the following reaction: 2 Mg (s) + O2 (g) 2 MgO (s) H = -1204 kJ (a) Is this reaction exothermic or endothermic? EXOTHERMIC (negative H) (b) Calculate the amount of heat transferred when g of Mg (s) reacts at constant pressure. g Mg ( 1 mol Mg / g) ( -1204 kJ / 2 mol Mg) = -59 kJ (2 SF) COEFFICIENTS MATTER! Note the 2 for Mg. When solutions containing silver ions and chloride ions are mixed, silver chloride precipitates: Ag+ (aq) + Cl- (aq) AgCl (s) H = kJ (a) Calculate H for production of mol of AgCl by this reaction.
5.69 The following is known as the thermite reaction 2 Al (s) + Fe 2O 3 (s) Al 2O 3 (s) + 2 Fe (s) This highly exothermic reaction is used for welding massive units, such as propellers for large ships. Using standard enthalpies of formation in Appendix C, calculate ΔH° for this reaction. Use Enthalpy of Formation data and equation:
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