Enthalpy of Born-Haber Cycles - Thermodynamics Pt B (3.3)
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Describe what happens in the enthalpy of formation of the ionic compound NaCl
• 1/2 a mole of Cl2 bond is broken • 1 mole of electrons is removed from Na • one mole of electrons is given to Cl • a formation of 1 mole of ionic bonds between Na+ & Cl- (Equation: Na(s) + 1/2 Cl2(g) -> NaCl(s)
What is first ionisation enthalpy?
• enthalpy change when 1 mole of gaseous atoms forms 1 mole of gaseous cations & 1 mole of electrons
What is electron affinity?
• enthalpy change when 1 mole of gaseous atoms gains 1 mole of electrons to form 1 mole of gaseous anions
What enthalpy change occurs when 1 mole of gaseous ions are formed from its elements under standard conditions?
Enthalpy of Atomisation
What enthalpy change occurs when gaseous cations & anions are made into an ionic solid in its standard states?
Lattice Enthalpy
Do we have to draw Born Haber cycles?
No - just be able to calculate values using it