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Thermochemistry and Nuclear Chemistry Test Review

|Substance |(Hf (kJ/mol) |

|C2H2(g) |228.2 |

|Ag2S(s) |-32.59 |

|AgCl(s) |-127.01 |

|H2S(g) |-23.9 |

|Ca(OH)2(s) |-983.2 |

|CO(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/mol |

|H2SO4(l) + Ca(s) ( CaSO4(s) + H2(g) |(H = (602.5 kJ/mol |

|Ca(s) + ½ O2(g) ( CaO(s) |(H = (634.9 kJ/mol |

|H2(g) + ½ 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? Answer: 0.200g

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