Chapter 23 - Chemical Energetics

DEFINITION

Standard enthalpy of atomization |

(Element and Compound)

Energy change when 1 mole of gaseous atom is formed from its element under standard conditions

e.g. C (s) → C (g)

Heat absorbed when 1 mole of gaseous compound is converted to gaseous atoms under standard conditions.

e.g. CH₄ → C (g) + 4H (g)

Electron affinity |

Energy change when 1 mole of gaseous atom gains 1 mole of electron

e.g. O (g) + e^- → O^- (g)

Lattice energy |

Energy change when 1 mole of an ionic compound is formed from its gaseous ions under standard conditions

e.g. Na⁺ (g) + Cl^- (g)→ NaCl (s)

Standard enthalpy of solution

Energy change when 1 mole of a substance dissolves in water

Standard enthalpy of hydration |

Energy change when 1 mole of gaseous ions are dissolved in water