1 mole of a compound
is formed from its
constituent elements
in their standard
states under standard
conditions
= products - reactants
Enthalpy
change of
combustion
1 moles of a
substance reacts
completely with
oxygen under
standard conditions,
all reactants and
products being in their
standard states
n=mass/molecular
mass
Standard
conditions
1 atmosphere
-298K
Concentration
of 1moldm^-3
Enthalpy
change of
reaction
The enthalpy change
that accompanies a
reaction in the molar
quantities expressed in
a chemical equation
under standard
conditions, all reactants
and products being in
their standard states