Everything about The Standard Enthalpy Change Of Reaction totally explained
The
standard enthalpy change of reaction (denoted
ΔH° or
ΔHo) is the
enthalpy change that occurs in a system when one mole of matter is transformed by a
chemical reaction under
standard conditions.
For a generic chemical reaction
» n
A A + n
B B + ... → n
P P + n
Q Q ...
the standard enthalpy change of reaction
ΔHr is related with the
standard enthalpy change of formation ΔHf of the reactants and products by the following equation:
In this equation, the
ni corresponds to the
stoichiometric coefficients.
Reactions with standard values
A common
standard enthalpy change is the
standard enthalpy change of formation, which has been determined for a vast number of substances. The enthalpy change of any reaction under any conditions can be computed, given the
standard enthalpy change of formation of all of the reactants and
products. Other reactions with standard enthalpy change values include combustion (
standard enthalpy change of combustion), neutralisation (
standard enthalpy change of neutralisation), and solution (
standard enthalpy change of solution).
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