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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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