SQSM-11 - Chapter 11 Nuclear Chemistry 1. Indicate the...

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Chapter 11 Nuclear Chemistry 11-1 1. Indicate the number of neutrons in each of the following nuclei. A Z N = A-Z a) 10 Be 10 4 6 b) 100 Mo 100 42 58 c) 75 As 75 33 42 d) 197 Au 197 79 118 3. Write the symbol, including atomic number and mass, for each of the following isotopes. a) Z = 26, A = 56 56 26 Fe b) A = 74, N = 40 74 34 Se c) Z = 54, N = 78 132 54 Xe 5. There are three naturally occurring isotopes of silicon. Use the data below to determine the atomic mass of Si. Mass(amu) Abundance 28 Si 27.97693 92.21% 29 Si 28.97649 4.70% 30 Si 29.97376 3.09% One mole of naturally occurring silicon contains: (0.9221 mole 28 Si)(27.97693 g/mol) + (0.0470 mol 29 Si)(28.94649 g/mol) + (0.0309 mol 30 Si)(29.97376 g/mol) or 28.086 g Si 7. The natural abundance of deuterium, 2 1 H , is 0.015%. How many deuterium nuclei are in 100. mL of water? ×× × × × 23 -2 21 2 2 22 2 1 mol H O 6.02 10 molecules 2 H atoms 1.5 10 D atom 100 g H O = 1.00 10 D atoms 18.0 g H O mol H O H O molecule 100 H atom 9. Determine the mass defects (in kg per mole) for the following nuclei. m atom = M m – Z(0.00055); m nucleons = Z(1.00728) + N n (1.00867); m = m nucleons - m atom Atom A Z N n M m m in g m in kg Br 79 35 44 78.9183 0.7373 7.373 x 10 -4 Ru 99 44 55 98.9061 0.9153 9.153 x 10 -4 11. What are the binding energies a nd binding energies per nucleon for each of the nuclei in Exercise 9? E (kJ) = mc 2 /1000 E (kJ)/A a) Br 6.6262 x 10 10 8.3876 x 10 8 b) Ru 8.2265 x 10 10 8.3095 x 10 8 13. Which nucleus in Exercise 9 is thermodynamically more stable? Nucleus with greater E/A is 79 Br as shown in Exercise 11.
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This note was uploaded on 01/27/2011 for the course CHEM 201 taught by Professor Wilson during the Spring '10 term at N.C. Central.

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SQSM-11 - Chapter 11 Nuclear Chemistry 1. Indicate the...

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