USC SOWK 666 - WORKSHEET 6 (4 pages)

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WORKSHEET 6



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WORKSHEET 6

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Pages:
4
School:
University of Southern California
Course:
Sowk 666 - Domestic Violence
Domestic Violence Documents

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J Muench WORKSHEET 6 CHEM 161 name 1 Given the following thermochemical reaction H2 g F2 g What is H for the reaction below HF g 2 HF g H 537 kJ H2 g F2 g 2 Solid sodium metal reacts very vigorously with water in a highly exothermic reaction 2 Na s 2 H2O l 2 NaOH aq H2 g H 368 6kJ a What amount of heat is produced when 0 500mol of Na s completely reacts b What amount of heat is produced when 0 875g of Na s completely reacts c What amount of heat is produced if 2 500mL of H2 g is collected Use a density of 0 082g mL for H2 g at 25oC 3 A 237g sample of molybdenum metal is heated to 100 1oC and then dropped into an insulated cup containing 244g of water at 10 0oC If the final temperature of the water and metal in the cup is 15 3oC then what is the specific heat of molybdenum J Muench 4 Insoluble AgCl precipitates out according to the reaction below When 250 mL of 0 18M AgNO3 and 125mL of 0 36M NaCl are mixed the temperature of the solution increases from 21 15oC to 22 90oC What is the enthalpy H per mole of AgCl formed Assume the density of the solutions are 1 00g mL and the specific heat is 4 18 J goC The baqlanced reaction is AgNO3 aq NaCl aq AgCl s NaNO3 aq 5 A 1 800g sample of octane C8H18 is burned a calorimeter whose total heat capacity is 11 66 kJ oC If the temperature of the calorimeter increased from 21 36oC to 28 78oC then what is the H for the combustion of one gram of octane How much is it for one mole 6 Using Hess s Law calculate H for the reaction note please do not use appendix C N2 g 2 H2 g N2H4 l given the following two reactions 1 N2H4 l O2 g 2 H2 g O2 g N2 g 2 H2O l H2O l H 622 2kJ H 285 8kJ J Muench 7 Using Hess s Law calculate H for the reaction note please do not use appendix C P4O10 s 6 PCl5 g 10 POCl3 g H given the following four reactions 1 P4 s 2 P4 s 3 PCl3 g 4 PCl3 g 6 Cl2 g 4 PCl3 g 5 O2 g P4O10 s Cl2 g PCl5 g O2 g POCl3 g H H H H 1 225 6 kJ 2 967 3 kJ 84 2 kJ 285 7 kJ 8 Using appendix C determine the H for each reaction below a Fe2O3 s



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