Enthalpy Definitions Flashcards
enthalpy change of reaction
enthalpy change associated with a stated equation, ΔrH
enthalpy change of formation
enthalpy change for the formation of 1 mol of a compound from its elements in their standard states, ΔHf
enthalpy change of combustion
enthalpy change for the complete combustion of 1 mol of a substance, ΔHc
enthalpy change of neutralisation
enthalpy change when formation of 1 mol of water from neutralisation, ΔHneut
average bond enthalpy
enthalpy change when breaking of 1 mol of bonds in gaseous molecules
lattice enthalpy
enthalpy change when formation of 1 mol of ionic lattice from gaseous ions, ∆HLE
enthalpy change of solution
enthalpy change when dissolving of 1 mol of solute, ∆Hsol
enthalpy change of hydration
enthalpy change when dissolving of 1 mol of gaseous ions in water, ∆Hhyd
atomisation enthalpy
enthalpy change when 1 mole of gaseous atoms is formed from the element in its standard state
ionisation energy
removal of 1 mol of the outer-most electrons from 1 mol of gaseous atoms ∆H 1ion
enthalpy
heat energy stored in a reaction
electron affinity
enthalpy change accompanying the addition of one electron to each atom in one mole of gaseous atoms to form one mole of gaseous 1- ions ∆Heg
FORMULA
enthalpy change of formation
Ca(s) + F2(g) → CaF2(s)
FORMULA
enthalpy change of combustion
CH4(s) + 2O2 → CO2 +2H2O
FORMULA
enthalpy change of neutralisation
NaOH + CH3COOH → H2O + CH3COONa
