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Chapter 12 Practice Set 2

Chapter 12 Practice Set 2. 1. 2 S + 3 O 2  2 SO 3 H = 791.4 kJ 791.4 kJ 1 mol S 6.44 g S 2 mol S 32.1 g S = 79.4 kJ. (79.4 kJ of heat is released.).

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Chapter 12 Practice Set 2

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  1. Chapter 12 Practice Set 2

  2. 1. 2 S + 3 O2  2 SO3 H = 791.4 kJ791.4 kJ 1 mol S 6.44 g S 2 mol S 32.1 g S = 79.4 kJ (79.4 kJ of heat is released.)

  3. 2. C + O2  CO2 H = 393.5 kJ393.5 kJ 1 mol C 4.72 g C 1 mol C 12.0 g C = 155 kJ (155 kJ of heat is released.)

  4. 3. H2 + Br2  2 HBr H = 72.80 kJ72.80 kJ 1 mol Br2 38.2 g Br21 mol Br2 160. g Br2 = 17.4 kJ (17.4 kJ of heat is absorbed.)

  5. 4. 2 P + 5 Cl2  2 PCl5 H = 886 kJ886 kJ 1 mol Cl2 1.48 g Cl25 mol Cl2 71.0 g Cl2 = 3.69 kJ (3.69 kJ of heat is released.)

  6. 5. C2H5OH + 3 O2  2 CO2 + 3 H2O H = 1366.7 kJ1366.7 kJ 1 mol 4.77 g C2H5OH C2H5OH C2H5OH1 mol 46.1 g C2H5OH C2H5OH= 141 kJ (141 kJ of heat is released.)

  7. 6. N2 + O2  2 NO H = 180. kJ180. kJ 1 mol N2 13.7 g N21 mol N2 28.0 g N2 = 88.1 kJ (88.1 kJ of heat is absorbed.)

  8. 7. 3 Fe + 2 O2  Fe3O4H = 1120.48 kJ1120.48 kJ 1 mol Fe 11.8 g Fe 3 mol Fe 55.8 g Fe = 79.0 kJ (79.0 kJ of heat is released.)

  9. 8. 2 H2 + O2  H2O H = 571.6 kJ571.6 kJ 1 mol H2 18.6 g H22 mol H2 2.02 g H2 = 2630 kJ (2630 kJ of heat is released.)

  10. 9. 4 NH3 + 5 O2  4 NO + 6 H2O H = 1170 kJ1170 kJ 1 mol NH3 14.9 g NH34 mol NH3 17.0 g NH3 = 256 kJ (256 kJ of heat is released...so exothermic.)

  11. 10. 6 C (graphite) + 3 H2  C6H6 H = 49.03 kJ49.03 kJ 1 mol C 5.81 g C 6 mol C 12.0 g C = 3.96 kJ (3.96 kJ of heat is absorbed...so endothermic.)

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