Definitions of enthalpy changes unit 1

definitions of the different enthalpy changes

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  • Created on: 10-01-13 16:22
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Definitions of enthalpy changes
Hf
The enthalpy change when I mole of a compound is formed from its elements
in their standard states at 298K and 1 atm
Hc
The enthalpy change when I mole of an element/compound is burned in
excess oxygen at 298K and 1 atm
1st ionisation energy
The enthalpy chance when 1 mole of atoms loses one mole of electrons in
the gaseous state
Hoa
· the enthalpy change for the production of one mole of atoms in the
gaseous phase from the element in its standard state
· eg. 1/2 Cl2 Cl (g)
Ho latt
The enthalpy change when 1 mole of a solid ionic compound is formed from
gaseous ions
· eg. Mg2+(g) + 2 Cl-(g) MgCl2(s)

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