ࡱ> Y[X{ bjbjzz .VFF|0t"q"s"s"s"s"s"s"$r$$'L"""?"!!!!!!q"!!q"!!!!!!`c9*!!]""0"!!p') p'!!!!lp'!!!""! "p'F f:  Name: Thermochemistry and Nuclear Chemistry Test Review Substance(Hf (kJ/mol)C2H2(g)228.2Ag2S(s)-32.59AgCl(s)-127.01H2S(g)-23.9Ca(OH)2(s)-983.2CO(g)-110.5 (Hf and specific heat values found in notes or in table provided. 1. Calculate the heat of the reaction for the following reaction: 2C2H2(g) + 5/O2(g) ( 4CO2(g) + 2H2O(g) (H = ? kJ/mol Solve by writing formation equations for each reactant and product and using the (H values for each. Is the reaction exothermic or endothermic? Answer: -2514.0kJ/mol (exothermic) 2. Calculate the (H value heat for the following reaction: Ag2S(s) + 2HCl(g) ( 2AgCl(s) + H2S(g) (H = ? kJ/mol Solve by writing formation equations for each reactant and product and using the (H values for each. Answer: -60.73kJ/mol (exothermic) 3. Calculate the (H value heat for the following reaction: Ca(OH)2(s) ( CaO(s) + H2O(g) (H = ? kJ/mol Solve by writing formation equations for each reactant and product and using the (H values for each. Answer: 106.5kJ/mol (endothermic) 4. Calculate the (H value heat for the following reaction: Fe2O3(s) + 3CO(g) ( 2Fe(s) + 3CO2(g) (H = ? kJ/mol Solve by writing formation equations for each reactant and product and using the (H values for each. Answer: 269.4kJ/mol (endothermic) 5. Calculate (H for the reaction of calcium oxide and sulfur trioxide. Is this reaction exothermic or endothermic? Answer: -385.9kJ/mol (exothermic) CaO(s) + SO3(g) ( CaSO4(s) (H = ? kJ/mol Use the following equations and data. H2O(l) + SO3(g) ( H2SO4(l)(H = (132.5 kJ/molH2SO4(l) + Ca(s) ( CaSO4(s) + H2(g)(H = (602.5 kJ/molCa(s) + O2(g) ( CaO(s)(H = (634.9 kJ/molH2(g) + O2(g) ( H2O(l)(H = (285.8 kJ/mol 6. Use enthalpies of combustion to calculate (H for the oxidation of 1-butanol to make butanoic acid. C4H9OH(l) + O2(g) ( C3H7COOH(l) + H2O(l) (H = ? kJ/mol Answer: -492.3kJ/mol Combustion of butanol: C4H9OH(l) + 6O2(g) ( 4CO2(g) + 5H2O(l) (Hc = (2675.9 kJ/mol Combustion of butanoic acid: C3H7COOH(l) + 5O2(g) ( 4CO2(g) + 4H2O(l) (Hc = (2183.6 kJ/mol 7 The reaction of magnesium with sulfuric acid was carried out in a calorimeter. This reaction caused the temperature of 55. grams of liquid water, within the calorimeter, to raise from 1.0(C to 28.(C. Calculate the energy associated with this reaction. Answer: 6200J 8 A 22..0 gram sample of solid gold was heated from 200.K to 300.K. How much energy was involved? Answer: 284J 9. Use (Hf values solve the following problems. Determine the (H for each of the following reactions. Classify each reaction as either exothermic or endothermic. a. C3H8(g) + 5O2(g) ( 3CO2(g) + 4H2O(g) (H = ? kJ/mol b. CH4(g) + 2O2(g) ( CO2(g) + 2H2O(g) (H = ? kJ/mol c. 2F2(g) + 2H2O(l) ( 4HF(g) + O2(g) (H = ? kJ/mol Nuclear Chemistry Review all problems found on the Nuclear Chemistry Worksheet. Be able to define fission and fusion and list examples of each. Complete the following nuclear equations: 1. 239 0 Np ( ( + 93 -1 _______________ 2. 9 4 Be + He ( 4 2 _________________ 3. 32 33 P + ( P 15 _____________ 15 Complete the following nuclear reactions and state the type of radioactive decay: 4. 43 43 K ( Ca + 19 20 ________________ 5. 233 229 U ( + Th 92 ____________ 90 6. 11 11 C ( B + 6 5 _________________ 7. Write the nuclear equation for the release of a beta particle by lead-210. Mass Defect and Nuclear Binding Energy Problems: 8. The energy released by the formation of a nucleus of iron-56 is 7.89X10-11J. Determine the mass defect of iron-56. Answer: 8.77X10-28kg 9. Calculate the nuclear binding energy of one uranium-238 atom. The actual measured atomic mass is 238.050784amu. Answer: 2.890519161X10-10J 10. Calculate the binding energy of one sodium-23 atom. The actual measured atomic mass is 22.989767amu. Answer: 2.9932429X10-11J Half Life Problems: 11. The half-life of thorium-227 is 18.72 days. How many days are required for three-fourths of a given amount to decay? Answer: 37.44 days 12. The half-life of protactinium-234 is 6.69 hours. What fraction of a given amount remains after 26.76 hours? Answer: 1/16 13. After 4797 years, how much of an original 0.250 grams of radium-226 remains? Its half-life is 1599 years. Answer: 0.0313g 14. The half-life of radium-224 is 3.66 days. What was the original mass of radium-224 if 0.0500 grams remains after 7.32 days? 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