BE per Atom.doc
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The binding energy per atom is calculated for metallic sodium (Na) and copper (Cu). For Na, the binding energy per atom is 1.109493 eV. For Cu, the binding energy per atom is 3.494386 eV. The calculations involve using the formula that relates molar cohesive energy to the number of atoms and ionic binding energy, and plugging in values for the molar mass and cohesive energy of Na and Cu.
BE per Atom.doc
- 1. 1 Calculate the binding energy per atom for metallic Na and Cu. Helping Tools No.1
- 2. 2 No.2
- 3. 3 OR No.3
- 4. 4 Solution
- 5. 5 We know that the relationship between the molar cohesive energy E and the ionic binding energy B is given by: 1 ( )(2 ) 2 coh coh A A E B N BN   Na (Sodium)
- 6. 6 23 23 19 23 19 23 4 Now, 107 / 6.02 10 / 107000 6.02 10 1 107000 ( 10 ) 1.602 6.02 10 66791.51 10 6.02 10 11094.93 10 1.109493 coh coh A A E E BN B N kJ mol X mol J X X X eV X X eV X X eV eV ï€ ï€½        
- 8. 8 23 23 19 23 19 23 4 Similarly, 337 / 6.02 10 / 337000 6.02 10 1 337000 ( 10 ) 1.602 6.02 10 210362.047 10 6.02 10 34943.86 10 3.494386 coh coh A A E E BN B N kJ mol X mol J X X X eV X X eV X X eV eV ï€ ï€½        