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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Presentation transcript:

Chapter 12 Practice Set 2

1. 2 S + 3 O 2  2 SO 3  H  =  kJ 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.)

2. C + O 2  CO 2  H  =  kJ kJ 1 mol C 4.72 g C 1 mol C 12.0 g C = 155 kJ (155 kJ of heat is released.)

3. H 2 + Br 2  2 HBr  H  = kJ kJ 1 mol Br g Br 2 1 mol Br g Br 2 = 17.4 kJ (17.4 kJ of heat is absorbed.)

4. 2 P + 5 Cl 2  2 PCl 5  H  =  886 kJ 886 kJ 1 mol Cl g Cl 2 5 mol Cl g Cl 2 = 3.69 kJ (3.69 kJ of heat is released.)

5. C 2 H 5 OH + 3 O 2  2 CO H 2 O  H  =  kJ kJ 1 mol 4.77 g C 2 H 5 OH C 2 H 5 OH C 2 H 5 OH 1 mol 46.1 g C 2 H 5 OH C 2 H 5 OH = 141 kJ (141 kJ of heat is released.)

6. N 2 + O 2  2 NO  H  = 180. kJ 180. kJ 1 mol N g N 2 1 mol N g N 2 = 88.1 kJ (88.1 kJ of heat is absorbed.)

7. 3 Fe + 2 O 2  Fe 3 O 4  H  =  kJ 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.)

8. 2 H 2 + O 2  H 2 O  H  =  kJ kJ 1 mol H g H 2 2 mol H g H 2 = 2630 kJ (2630 kJ of heat is released.)

9. 4 NH O 2  4 NO + 6 H 2 O  H  =  1170 kJ 1170 kJ 1 mol NH g NH 3 4 mol NH g NH 3 = 256 kJ (256 kJ of heat is released...so exothermic.)

10. 6 C (graphite) + 3 H 2  C 6 H 6  H  = kJ 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.)