1 / 8

CI 4.6 – Born-Haber Cycle

CI 4.6 – Born-Haber Cycle. (C) JHUDSON 2005. -. -. -. -. -. -. -. -. +. +. +. +. +. +. +. What do we mean by lattice enthalpy?.

marsden-reese
Télécharger la présentation

CI 4.6 – Born-Haber Cycle

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CI 4.6 – Born-Haber Cycle (C) JHUDSON 2005

  2. - - - - - - - - + + + + + + + What do we mean by lattice enthalpy? For an ionic compound the lattice enthalpy is the enthalpy change when one mole of solid in its standard state is formed from its ions in the gaseous state. For an ionic compound the lattice enthalpy is the enthalpy change when one mole of solid in its standard state is formed from its ions in the gaseous state. The lattice enthalpy cannot be measured directly and so we make use of other known enthalpies and link them together with an enthalpy cycle. This enthalpy cycle is the Born-Haber cycle.

  3. θ S H = +107kJmol-1 -100 -200 -300 -400 kJmol-1 Born-Haber Cycle for Sodium Chloride +800 +700 1 Sublimation of Sodium +600 +500 +400 +300 +200 Na(g) + 1/2 Cl2(g) +100 Na(s) + 1/2 Cl2(g) 0

  4. θ D ½ H = +121kJmol-1 -100 -200 -300 -400 kJmol-1 Born-Haber Cycle for Sodium Chloride +800 +700 +600 2 Bond Dissociation of Chlorine +500 +400 +300 Na(g) + Cl(g) +200 Na(g) + 1/2 Cl2(g) +100 Na(s) + 1/2 Cl2(g) 0

  5. θ I H = +502kJmol-1 + -100 -200 -300 -400 kJmol-1 Born-Haber Cycle for Sodium Chloride +800 Na+(g) + Cl(g) +700 e- +600 e- 3 First Ionisation of Sodium +500 e- +400 e- e- +300 Na(g) + Cl(g) +200 Na(g) + 1/2 Cl2(g) +100 Na(s) + 1/2 Cl2(g) 0

  6. θ E H = -355kJmol-1 - -100 -100 -100 -200 -200 -200 -300 -300 -300 -400 -400 -400 kJmol-1 Born-Haber Cycle for Sodium Chloride +800 +800 +800 Na+(g) + Cl(g) +700 +700 +700 4 Electron Affinity of Chlorine +600 +600 +600 +500 +500 +500 +400 +400 +400 Na+(g) + Cl-(g) +300 +300 +300 Na(g) + Cl(g) Na(g) + Cl(g) Na(g) + Cl(g) +200 +200 +200 Na(g) + 1/2 Cl2(g) Na(g) + 1/2 Cl2(g) Na(g) + 1/2 Cl2(g) e- +100 +100 +100 Na(s) + 1/2 Cl2(g) Na(s) + 1/2 Cl2(g) Na(s) + 1/2 Cl2(g) 0 0 0

  7. - - - - - + + + + -100 -100 -100 θ F H = -411kJmol-1 -200 -200 -200 -300 -300 -300 -400 -400 -400 kJmol-1 Born-Haber Cycle for Sodium Chloride +800 +800 +800 Na+(g) + Cl(g) +700 +700 +700 +600 +600 +600 +500 +500 +500 +400 +400 +400 Na+(g) + Cl-(g) +300 +300 +300 Na(g) + Cl(g) Na(g) + Cl(g) Na(g) + Cl(g) +200 +200 +200 Na(g) + 1/2 Cl2(g) Na(g) + 1/2 Cl2(g) Na(g) + 1/2 Cl2(g) +100 +100 +100 Na(s) + 1/2 Cl2(g) Na(s) + 1/2 Cl2(g) Na(s) + 1/2 Cl2(g) 0 0 0 5 Formation of Sodium Chloride NaCl(s)

  8. - - - - - + + + + -100 -100 -100 θ L H = -786kJmol-1 -200 -200 -200 -300 -300 -300 -400 -400 -400 kJmol-1 Born-Haber Cycle for Sodium Chloride +800 +800 +800 Na+(g) + Cl(g) +700 +700 +700 +600 +600 +600 +500 +500 +500 +400 +400 +400 Na+(g) + Cl-(g) +300 +300 +300 Na(g) + Cl(g) Na(g) + Cl(g) Na(g) + Cl(g) Lattice Enthalpy for Sodium Chloride +200 +200 +200 Na(g) + 1/2 Cl2(g) Na(g) + 1/2 Cl2(g) Na(g) + 1/2 Cl2(g) +100 +100 +100 Na(s) + 1/2 Cl2(g) Na(s) + 1/2 Cl2(g) Na(s) + 1/2 Cl2(g) 0 0 0 NaCl(s)

More Related